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I mean “be quiet”.

Because he was not able to tell the waiter he was hungry.

Yes. Because they are useful when we can't express ourselves clearly./No. Because body languages

may lead to misunderstanding.

60 per cent of the students think it's a good idea to move to Mars. First of all, Mars has an environment

similar to that of the Earth. There is no pollution on Mars. Moreover, life on Mars must be challenging

as well as interesting. People can start all over again and build a new world on Mars.

However, 40 per cent of the students hold the opposite opinion. Mars is too far away for spacecraft

to reach. The journey will be long and uncomfortable. The problems of gravity, food, water and oxygen

may stop people living on Mars.

I hope to move to Mars in the future because I want to have some challenging experiences.