--- Oh, dear. I forgot the air tickets.
--- You ______ something.
| A．have left | B．are always leaving |
| C．are leaving | D．always left |
The police _________ the mountain to ________ the murderer.
| A．is searching; search for |
| B．are searching for; search |
| C．is searching for; search |
| D．are searching; search for |
He told me that he had mailed part of the samples样本 and that the rest _____ in a few days.
| A．were following | B．have followed |
| C．has followed | D．was following |
He will give us a report on how to study English well, but when and where ________.
| A．is still unknown. | B．hasn’t decided |
| C．is known | D．haven’t been decided |
We should work together to build a society for kids, ________free from war and violence.
| A．one | B．this | C．it | D．that |
He slipped(溜进) into the classroom without ___________.
| A．noticed | B．noticing |
| C．being noticed | D．was noticed |