单项选择（每题1分）
—I can’t find my MP4 anywhere．
—_____ it be in your handbag?
| A．May | B．Must | C．Can | D．Should |
__________ he promised that he wouldn't be late, he didn't arrive until the end of the party.
| A．Since | B．Although |
| C．Because | D．Until |
Jerry has promised to keep the secret, so he won't tell anyone __________ asked to.
| A．until | B．now that |
| C．unless | D．even though |
Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky，__________？
| A．though | B．also |
| C．either | D．too |
Hot __________ the night air was, we slept deeply because we were so tired after the long journey.
| A．although | B．as |
| C．while | D．however |
__________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．Although | B．As long as |
| C．If only | D．As soon as |