【题目】 I think _____________ necessary to do some morning exercises every day.

【题目】Without friends， one can’t be happy although he is rich enough. As for me， I will never forget the most wonderful days________ I spent with my friends.

【题目】From the table， we can see the prices of the books. You should pay ______if you buy each book of them.

【题目】The students have to (keep) their hair short.

【题目】My sister is good ______ volleyball.

【题目】Do you have fun (learn) English?

【题目】Which word of the following has a different stress from others?

【题目】Tom ______ go to bed late, but now he _______ to bed early.

【题目】Anyone who refuses _______ others carefully will lose respect for themselves.

【题目】 —Your voice is very sweet. —________.