________parents say and do has a lifelong effect on their children.
| A．That | B．Which |
| C．What | D．As |
34. The lake used to be polluted, but now something_____ to make it clear again.
| A．is being done | B．does | C．is doing | D．is done |
33. _____ the television on at night, he disturbed others. You’d better speak to him.
| A．While | B．As | C．With | D．Due to |
32. _____in charge of the shopping center, Bob had to read magazines to kill time.
| A．Having left | B．Being left | C．To leave | D．Left |
31. It is on the maglev train that is very comfortable _____ I have been to the People’s Square.
| A．that | B．how | C．where | D．When |
30. The price _____ should have made you realize it was a trick.
| A．alone | B．just | C．simple | D．Only |