1.  It's too dark.  It is time for us to l________.
2.  He l________ Dalian f________ America.
3.  —Where's your father? Does he l________ Changchun?
      —No.  But he is l________ for Tibet.
4.  My uncle is a farmer, he lives in the c________.
5.  I love n________ ,  because it makes me enjoy n________  air.
6.  You are on duty.  Don't f________ to clean the classroom.
7.  I s________ an hour on my homework.

1. Turn on the l            , please. It's too dark here.
2. The young girl sent an email to the company, but they didn't r             to it.
3. The boss asked Peter to c             all the rubbish (垃圾) from the office.
4. The population of the city has r              up to five million.
5. "Don't lie on the wet g           . It's bad for your health," the mother said to her son.
6. "Can you answer the questions b            ?" the teacher asked.
7. Tom wants to know when dinosaurs d             from the earth.
8. The d             between Beijing and Shanghai is about 1,000 kilometres.
9. Have you ever seen a h             whale in the sea?
10. All the windows of my house f             the south.

1. All of us are s______ to hear that bad news.
2. I lost my knife. I looked for it e______ but I can't find it.
3. The window is b______. We need to repair it.
4. It's too dark in your study. Please turn on the table l______.
5. Today many things are made of p______, for example, bottles, plates, bowls and so on.