7. Sit on the sofa if you feel (comfortable) on the hard chair.

6. The road is always (crowd) during the rush hour.

5. These chicken wings are really (taste) . Where did you buy them?

4. I think (dry) food is the most important to an astronaut.

3. The doctor told him to have a (sleep) pill before going to bed to help him sleep well.

2. A special bag is usually fixed to the walls to prevent (float) .

1. How many (spacecraft) does the US have?

1. There is a balloon (飄浮) in the sky.

10. Each (a person who is travelling in a car,bus,train,etc. and who is not driving it or working on it) is allowed to carry 30 pounds of luggage free of charge.

9. Most living things cannot live without (氧氣) .