—Who ______ it be that hasn't handed in his homework?
—It ______ be Bob. He handed it in yesterday.
| A．can; mustn't | B．must; can |
| C．can; can't | D．may; must |
.
――Oh, what a pity! All the tickets were sold out.
――I'm sure we_______ two, but you were not quick enough.
| A．could buy | B．had bought | C．would buy | D．could have bought |
.
Unless you have planted something, you won7t be able to know the pleasure of watchintit _______
| A．grown | B．growing | C．to grow | D．to be grown |
.
Jim has_______so much weight that many of his clothes don't fit him any more.
| A．won | B．put | C．achieved | D．gained |
.
Hardly_______when the fans began to scream with excitement.
| A．the star showed up | B．did the star show up |
| C．had the star showed up | D．the star had showed up |
.
Tom_______at least three coffees every day until his doctor told him to limit it to one.
| A．had drunk | B．drank | C．has been drinking | D．has drunk |