—Can you work out the problem? —I can’t ______your explain how to do it.
| A．but for | B．except | C．apart from | D．unless |
A single pipeline ___________ all the houses with water.
| A．is served | B．serves | C．are serving | D．serve |
Whom would you rather _________ you to the hospital?
| A．have sending | B．have send | C．having send | D．having sent |
Prices of daily goods _______ through a computer can be lower than store prices.
| A．are bought | B．bought | C．been bought | D．buying |
Go and see that play. I______ you'll enjoy it.
| A．guarantee | B．complaint | C．budget | D．feel |
He must have attended the meeting yesterday, ___he?
| A．didn’t | B．mustn’t | C．needn’t | D．hadn’t |