Our country should set up more national parks animals can live freely.
| A．when | B．which | C．where | D．whose |
They happen to be of age ,and they all go in for American football.
| A．the same ;the | B．不填；不填 |
| C．an;不填 | D．an;the |
I have no idea how it that the man met with trouble again.
| A．came about | B．came out |
| C．came up | D．came across |
Going out for a trip with friendspopular in the last few years .
| A．is | B．was | C．has been | D．had been |
—Tom came to work last Friday ,but no one has seen him since.
—he have had an accident ?
| A．Should | B．Must | C．Might | D．Could |
—I telephoned him twice and I couldn’t get through to his home.
—I think the line might have been out of order, ________?
| A．don’t you | B．wasn’t it | C．do you | D．hadn’t it |