12．He has learned English for years.but he can understand the native speakers．( )A．alwaysB．certai——青夏教育精英家教网——

12．He has learned English for years，but he can understand the native speakers．（　　）

11．When you see some litter on the ground，please_____．（　　）

10．Your mother is very ill．Have you______ a doctor？（　　）

9．I think everyone should know what to do if a fire ____________．（　　）

8．Who can ________ a better idea to increase sales？（　　）

7．He ________ the holiday because the children got sick．（　　）

6．-Dad，science is too hard for me．
─Honey，if you listen ________ in class，you'll find it easy．（　　）

5．-Mr Green looks very serious．
-______he is very kind．（　　）

4．--What do you think of Lucy？
--She is a good student．She ____ does homework carelessly．（　　）

3．-__________ will the astronaut be away from the earth？
-For about three weeks!（　　）

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