Hurry up, _______ you will miss the bus.
| A．otherwise | B．however |
| C．and | D．so |
The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.
| A．applications | B．organization | C．expression | D．attention |
What a moving _____to see so many people offer help to these in danger!
| A．sight | B．scene | C．view | D．scenery |
—Please let me know where David is. I couldn’t find him anywhere.
—Well, he _____have gone far—his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
He should have come here earlier, but he hasn’t _____yet.
| A．turned in | B．turned up | C．turned on | D．turned out |
—Do you mind if I borrow your dictionary?
— _________.
| A．Yes,you may borrow | B．Yes,you could | C．No,help yourself | D．No,go on |