My phone is broken．It________just now．
| A．came out |
| B．went off |
| C．took off |
| D．set off |
Which book is ______ to understand, this one or that one?
| A．easy | B．easier | C．easiest | D．the easiest |
I phoned Sarah last night, ______ there was no answer.
| A．and | B．but | C．or | D．so |
I always go skiing with my friends ______ winter.
| A．in | B．on | C．at | D．for |
The students are talking about ______ holiday plans happily.
| A．his | B．her | C．its | D．their |
Nobody knows ______ yesterday.
| A．how the accident happens |
| B．how does the accident happen |
| C．how the accident happened |
| D．how did the accident happen |