_____ what would happen，none of them could find a way out.
| A．Left wondering | B．Having left wondering |
| C．Leaving to wonder | D．Having left to wonder |
Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.
| A．of; at | B．by; in |
| C．of; on | D．on; at |
—Would you rather ______ there to attend the lecture tomorrow?
—No, I’d rather he ______ there instead of me.
| A．to go; will go | B．go; went |
| C．go; will go | D．going; shall go |
It is hard for us to eat better, exercise more, and sleep enough, ________ we know we should.
| A．since | B．even if |
| C．unless | D．as if |
At the conference, they came up with three different _____ to solving the serious problem.
| A．approaches | B．means |
| C．methods | D．ways |
The music brought the days back to me _____ I was out of work wandering hopelessly on the streets.
| A．until | B．that | C．when | D．which |