28．—Surely you can turn to David for help．
—__________He is the last one you can depend on．
| A．I couldn’t agree more. | B．Is that right? |
| C．Get out of it! | D．It’s up to you． |
—________ one and a half months enough for the project to be finished?
—I am afraid not.The professor is ill and only after he recovers ________ go on with it.
| A．Is；he can | B．Are；he can |
| C．Is；can he | D．Are；can he |
Look！The ground is wet.It must have rained last night，________？
| A．hasn’t it | B．didn’t it |
| C．mustn’t it | D．hadn’t it |
There is not much time left，but________we must get there on time.
| A．somehow | B．somewhat |
| C．however | D．anyhow |
The driver was at ________ loss when ________ word came that he was forbidden to drive because of speeding.
| A．a；the | B．/；/ |
| C．the；the | D．a；/ |
You’d better put on a heavy coat.Sometimes it________be very cold here at night.
| A．should | B．can |
| C．will | D．must |