UFOs are ____________ objects that some people report they have seen in the sky.

Do you understand the saying: “________________ is better than cure”? (prevent)

Choose the correct answer:

A: Would you like to go on a trip to Sa Pa with me?

B: __________. I’m working on my coming exam.

The man asked me _________ I __________ the way to The Great Wall.

That plan can’t be developed without the ______________ of the Republic. (cooperate)

UFOs are just the _______________ of some writers. (imagine)

The astronauts are looking forward ____________ to the Earth.

People in this remote village have ___________ contact with the outside world.

Choose the correct form of verbs.

Everyone has a number of _________________, but no one has many true friends. (acquaint)

They are trying to look for another __________________. (explain)

Japan has a very big _____________ of making cars.

UFOs means _______________ Flying Objects. (identify)

Stories about UFOs are always __________________. (mystery)

What would you do if you _____________ a UFO?

They are watching _______________ programmes on TV. (entertain)

In order to have an excellent physical condition, astronauts must have ____________ training before their space trip.