7 . 根据句意，选用方框内所给词组填空。注意形式的变化。

set out, separate from, make a mess, believe in, be responsible for

1. Yesterday they ________ of the room. But now everything in the room is clean and tidy.
2. I think he ________ the thing because I know he is a responsible person.
3. The scientist has achieved what he ________ to do three years ago.
4. If you ________ yourself, I think you will have a chance to succeed.
5. The boy ________ the others because he often has fights with them.

9 . The report says that in the Jingjinji area, coal burning seems to ________ 9 percent of main particles (颗粒) that make up PM 2.5.

A．be used for

B．be responsible for

C．be thirsty for

10 . 根据语境，选择恰当的短语完成下列各句。短语中有一个为多余选项。

at a time       tea sets       sold out       take pride in       be responsible for       on time

1. As a Chinese, I really ________ our amazing achievements.
2. All of the spaghetti across the country had been ________ overnight because of the hoax.
3. My grandfather enjoys collecting ________, he often shares them with his tea friend.
4. Stop making excuses for your mistakes. You should ________ what you have done as an adult.
5. It is hard to do more than one thing at the same time, we should do one thing ________ and do it well.