—Did Alan enjoy seeing his old friends yesterday?
—Yes, he did. He his old friends for a long time.
| A．wouldn’t see | B．hadn’t seen | C．didn’t see | D．hasn’t seen |
The sunspot came into its active stage, __________ that happens once every eleven years.
| A．one | B．it | C．the one | D．what |
It’s already 10’clock. I wonder how it ____ that she was two hours late on such a short trip.
| A．came over | B．came out | C．came about | D．came up |
Many strange new means of transport have been developed in our century, the strangest of _____ being perhaps the hovercraft(气垫船).
| A．which | B．them | C．that | D．it |
___ the temperature might drop, coal was prepared for warming.
| A．To consider | B．Considered | C．Considering | D．To be considered |
We had a really bad time about six months ago but now things are ____.
| A．looking up | B．coming up | C．making up | D．turning up |