Jack almost fell off the cliff, but managed to _____ until help came.
| A．keep on | B．catch on | C．count on | D．hang on |
---I didn’t go to the party yesterday because my car broke down.
---You ______ mine. I wasn’t using it.
| A．ought to borrow | B．would have borrowed |
| C．had better borrow | D．could have borrowed |
---They are quiet, aren’t they?
---yes. They are accustomed ____at meals.
| A．to talking | B．to not talking | C．to not talk | D．to talk |
_____, I got better and returned to work.
| A．Accidently | B．Normally | C．Eventually | D．Particularly |
It is already 10 o’clock. I wonder how it ______ that she was two hours later on such a short trip.
| A．came over | B．came out | C．came about | D．came up |
--Why does the lake smell terrible?
---Because large quantities of water ______.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |