The growing speed of a plant is influenced by a number of factors，____are beyond our control.
| A．most of them | B．most of which | C．most of what | D．most of that |
I don't know whether to stay in teaching or _____ another job.
| A．trying getting | B．to try to get | C．trying to get | D．try get |
If you _____ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |
They weren't a particularly good team, but they refused to give in and _____ defeat.
| A．accept | B．accepted | C．accepting | D．to have accepted |
—Must I turn off the gas after cooking ?
--Of course . You can never be ___ careful with that.
| A．enough | B．too | C．so | D．very |
There are five pairs, but I'm at a loss which _____ to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |