In the past few years, great changes in Chongqing.
| A．have taken place | B．took place |
| C．have been taken place | D．have happened |
My parents are very strict me because they always worry my success in the future.
| A．in; about | B．with; of |
| C．in; with | D．with; about |
The math question is difficult for the students work out.
| A．too; to | B．so; that |
| C．such; that | D．enough; to |
Some terrorists the music hall in Paris and killed over 100 people on Nov. 13.
| A．came | B．entered | C．went | D．left |
People write letters to friends and relatives, but now WeChat and QQ communicating with others widely.
| A．used to; are used to |
| B．are used to; are used for |
| C．used to; are used for |
| D．are used to; used to |