The boys were about to go out to play football suddenly it began to rain.
| A．when | B．as | C．while | D．then |
Please leave your phone number ______ we can get in touch with you in case of emergency.
| A．so that | B．on condition that | C．for fear that | D．so long as |
They demanded that the books ______ to the school library right away.
| A．should return | B．be returned | C．were returned | D．returned |
The trade union intended to call on the workers to go on strike ______ the government’s limitation on exports.
| A．in memory of | B．in honor of | C．in need of | D．in response to |
By the time you come back, your aunt ______ for Nanjing to attend a meeting.
| A．will leave | B．leaves | C．left | D．will have left |
______ frightened us ______ a tiger turned up suddenly in front of us.
| A． What; was that | B．What; was | C．It; that was | D．It was; that |