Sometimes the police wear casual clothes to ____ special tasks.
| A．carry off | B．carry on | C．carry with | D．carry out |
——We can use QQ to chat with each other on the Internet.
——Really? Will you please show me ________ ?
| A．how to use it | B．what to use it |
| C．how can I use it | D．what can I use it |
——What do you usually do in your free time?
—— I enjoy reading in the library ________ has many good books.
| A．when | B．who | C．which | D．what |
——Susan has never been to Beijing, ________?
——________, she went there with her parents last month.
| A．did she; No, she didn’t | B．didn’t she; Yes, she did. |
| C．has she; Yes, she has. | D．hasn’t she; No. she hasn’t. |
——Will you come to the dinner party?
——I won’t come unless Mary ________.
| A．invites | B．will be invited | C．is invited | D．invited |
——Mary stays alone in the classroom and looks sad.
——________ to her?
| A．What happens | B．What is happened |
| C．What is happening | D．What was happening |