1 . This lock is _________(damage). This door will never open.

2 . ____________ (advance) lights, motors, and building designs have helped save a lot of energy and therefore prevented pollution.

3 . Lin Tao likes to take part in____(variety) activities.

4 . A man in a (n) ________ (鲜艳的) grey suit sat on the other side of the bar.

5 . ________(disappoint) at failing in the math exam, John wouldn’t like to talk about it to his parents.

6 . Please help me to draw off these________(mud) boots.

7 . It’s ________(显然) that if everyone can save a drop of water, we can save a lot of people.

8 . Hot and cold are ________ (相反的) words.

9 . It’s an interesting idea but there are many ______ (practise) difficulties.

10 . It is still one of the most ______（不寻常的）places I have ever been. （根据汉语提示单词拼写）