_________to reach them on the phone, we sent an email instead.
| A．Fail | B．Failed | C．To fail | D．Having failed |
You’d better book the tickets in advance; _______ we may miss the concert.
| A．however | B．therefore | C．nevertheless | D．otherwise |
Isn’t it lovely to think that I ________ myself on the sunny beach tomorrow at this time.
| A．will enjoy | B．will be enjoying | C．am enjoying | D．shall enjoy |
— You must be looking forward to your trip to Sydney.
— Yes. I wait any longer.
| A．can't | B．mustn't | C．needn't | D．shouldn't |
most parents care about is to provide the best education for their children.
| A．That | B．How | C．What | D．Whether |
The dancers, all of _______ masks came off suddenly, gave us a great surprise.
| A．their | B．whose | C．which | D．whom |