4 . —__________ drop rubbish while climbing the mountain. It’s bad for the environment.
—I will keep that in mind.

A．Don’t remember to

B．Remember to not

C．Remember not to

D．Remember

9 . 选词填空

depend on,   in particular,   in panic,   one by one,     look forward to,     turn around,     go all out,     come across, graduate from,   deal with,   step into,   at the sight of,   have a frog in one’s throat,       as if,   wind up

1. Jimmy has made great progress in all subjects this term, chemistry ________.
2. Whenever we ________ new words, we may look them up in the dictionary.
3. We ________ the day when the scientists can invent the vaccine.
4. Now he is in trouble,   we should ________ to help him.
5. Students are required to go to work in poor mountain areas after ________ university.
6. Tina met so many difficulties, but she did her best to ________.
7. Little Tom was very nervous in front of so many strangers, so he _________ and ran to his mother.
8. The school organised a collection exhibition, and students presented their collections _________.
9. Office workers fled _________ as the fire broke out.
10. Choosing the right bike _________ what you want to use it for.
11. When the teacher ________ the classroom, Mary noticed he was very angry.
12. ________ the beautiful buildings, Lisa felt very happy.
13. She needed to go to the hospital, because she ________ for many days.
14. I felt ________ high school was only yesterday.
15. When I ________ the speech, it ends.