根据每题中所给的首字母或中文提示，写出相应的单词形式。

注意：每个空格只填1个单词。

1．Tom is a clever boy who has a s______ mind．He Can always find the answers to many difficult questions easily．

2．--How______ many chairs do we need?

--Let me see．A______ there are about 20 people at the dinner．

3．After running for a mile in the sun，he got home，almost w______ out．

4．--Can the young man take charge of the company?

--I’m afraid it’s b______ his ability．

5．It may be fairly cheap to buy，but you’ve got to take into c______ the money you’ll spend on repairs．

6．Emergency water aid has been siren to help______ （缓解）lack of water of the drought hit area.

7．Today，there are many teenagers______ （沉溺于）to playing computer games，which is a waste of time for them．

8．In order not to waste your time，I will come straight to the______ （要点）∞that you can get to know the main idea．

9．The thirty-storey building is one of the most challenging projects they have ever______ （承担）.

10．With the development of society，hundreds and hundreds of private can have______ （涌现）up like mushrooms in our city in recent years．