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Suggested answer:

It is worthwhile to spend money on this project, for the career skills you acquire in the process are bound to help improve your prospects in your search for a job and all your efforts will eventually pay off.

3. 虽然通过和这些志愿者并肩工作，我可以学会怎样与他人合作，但我得交参加费。我不得不承认为此我正在花更多的时间去兼职挣钱，这让我总觉得时间不够用。(work side by side with / alongside ...; acknowledge; save up for) Suggested answer:

Though I can learn teamwork by working side by side with other volunteers, I need to pay for the participation. I have to acknowledge that I am now spending more time doing part-time jobs to save up for the project, which makes me feel a shortage of time.

4. 不同的运动在身高、年龄、力量、耐力等方面对参加者有不同的要求。因此有多少种运动就有多少类型的运动员。想参加运动的人总能找到合适的项目。(in terms of; as many... as ...; no doubt) Suggested answer:

Different sports have different requirements in terms of height, age, strength and stamina. Therefore, there are as many types of athletes as there are sports. There can be no doubt that anyone who wants to get some exercise can find the right sport.

Unit10

Correct answer 1. television 2. telescope 3. telegraph 4. telephone 5. telepathy

6. telecommunications

Form compound adjectives with -free to describe the things.

1. : a phone you can use in your car and which you don't need to hold in your hands Correct answer hands-free phone

2. : beer which doesn't contain any alcohol Correct answer alcohol-free beer

3. : sweetener you can add to drinks like coffee or tea and which doesn't contain sugar Correct answer

sugar-free sweetener

4. : an area in a town where traffic is not allowed Correct answer traffic-free area

5. : petrol which does not have any lead in it Correct answer lead-free petrol

Rewrite the sentences using used to do or used to doing. Follow the examples.

Examples:

Students were different in the past.

Students aren't what they used to be.

Many students have lost the habit of reading books.

Many students are not used to reading books anymore.

1. Once people thought time travel was impossible. Suggested answer:

People used to think time travel was impossible.

2. Today some of us are beginning to accept the idea. Suggested answer:

Today some of us are getting used to accepting the idea.

3. In the old days people believed everything they saw at the cinema. Suggested answer:

People used to believe everything they saw at the cinema.

4. Some students are not in the habit of thinking critically. Suggested answer:

Some students are not used to thinking critically.

5. In the past people thought exploring outer space impossible. Suggested answer:

People used to think exploring outer space impossible.

6. Some people are not in the habit of keeping up with the latest fashion. Suggested answer:

Some people are not used to keeping up with the latest fashion.

Rewrite the sentences using what. Follow the example.

Example:

This effect of warping spacetime gives rise to gravity.

This effect of warping spacetime is what gives rise to gravity.

1. Four dimensions are difficult to imagine. Suggested answer:

Four dimensions are what is difficult to imagine.

2. We know we can travel forwards, backwards and sideways in space. Suggested answer:

That we can travel forwards, backwards and sideways in space is what we know.

3. Any object with a smaller mass appears attracted to the sun. Suggested answer:

Any object with a smaller mass is what appears attracted to the Sun.

4. They rely on the new technology to increase their output. Suggested answer:

The new technology is what they reply on to increase their output.

5. Time, space, matter and energy no longer have well-defined meaning. Suggested answer:

Time, space, matter and energy are what no longer have well-defined meaning.

6. We call them traditional virtues, which still have great significance today. Suggested answer:

They are what we call traditional virtues, which still have great significance today.

7. Scientists of the future may well pursue a new form of futuristic technology based on quantum effects. Suggested answer:

A new form of futuristic technology based on quantum effects is what scientists of the future may well pursue.

Translate the sentences into Chinese.

1. But unfortunately, once inside the box, it explodes, and Kugelmass finds himself not back in the world of literature, but in an old textbook, Remedial Spanish, being chased by an irregular verb. It's a surreal story, one among many in novels since H.G. Wells wrote The Time Machine in 1895. Suggested answer:

可不幸的是，他刚进去盒子就爆炸了。库格马思发现自己并未回到文学世界，而是落入一册名叫《西班牙语补习》的旧课本里，被一个不规则动词追得到处跑。这是一个超现实的梦幻故事，自1895年H.G.威尔斯写《时间机器》以来，类似的故事在许多小说中出现过。

2. Because the universe is filled with heavy objects exerting gravitational pull, spacetime is not flat but an irregular series of curves. We know this because astronomers can see stars which should be invisible because they're blocked by closer obstructions. Instead of travelling in a straight line, the light from these stars bends round anything which gets in the way.