．— Have you ever visited the Opera House?
—Yes．When I was in Sydney, I ______ it twice．
| A．have visited | B．visited | C．had visited | D．would visit |
The man needed _____ for one of his legs was badly injured.
| A．to look after | B．looking after | C．look after | D．being looked after |
I’ll spend the evening ______ in your room waiting for the thief to arrive.
| A．locking | B．in locking | C．being locked | D．locked |
—Car 18 won the race.
—Yes. But its driver came close to ______.
| A．having been killed | B．have been killed |
| C．be killed | D．being killed |
. ___ to nuclear radiation, even for a short time may produce variants（变异体）of genes in human bodies.
| A．Being exposed | B．Having exposed |
| C．Exposed | D．After being exposed |
Michael never dreamt of ____ for him to be sent abroad very soon.
| A．being a chance | B．there’s a chance |
| C．there to be a chance | D．there being a chance |