I enjoy fresh air so I always let the window open ________ it is really cold.
| A．unless | B．when | C．if | D．since |
She can hardly write her own name, ______?
| A．can she | B．can't she | C．need she | D．needn't she |
—______ the afternoon of June 2nd, many foreigners arrived ______ Shanghai.
| A．In; at | B．On; to | C．In; in | D．On; in |
They didn't go to bed_____ the work was finished.
| A．when | B．while | C．until | D．after |
一______ is your father?
— A bank clerk. He works in a bank near my home.
| A．Where | B．How | C．What | D．Which |
______ went hiking last weekend because of the bad weather.
| A．Someone | B．No one | C．Everyone | D．Nothing |