Nobody can explain the mystery ____ he suddenly disappeared.
| A．why | B．what | C．whether | D．which |
---Linda didn’t invite us to the party.
— ______? I don’t care.
| A．For what | B．So what | C．What’s on | D．What’s up |
There was such a long queue for coffee at the interval that we ________ gave up.
| A．eventually | B．unfortunately |
| C．generously | D．purposefully |
Could you give me a hand？It seems that my strength has________.
| A．used up | B．run out |
| C．been given out | D．run out of |
—We should adopt ________methods to deal with some incidents. You know，anything could occur in that situation.
—I got it. Thank you for reminding me.
| A．flexible | B．typical |
| C．positive | D．concrete |
It was in the lab ________was taken charge of by Johnson ________they did the experiment.
| A．where；which | B．which；that | C．which；which | D．that；which |