— Do you 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 |
You’d better go there by train. The train ticket is________ the airplane ticket.
| A．as cheap three times as | B．as three times cheap as |
| C．three times cheaper than | D．cheaper three times than |
—Shall I give you a ride as you live so far away?
—Thank you，________.
| A．it couldn’t be better | B．of course you can |
| C．if you like | D．it’s up to you |
At times the balance in nature is____, resulting in a number of possibly unforeseen effects.
| A．confused | B．puzzled | C．disturbed | D．troubled |
If I ruled the world，I would________ the world________ everything that is bad.
| A．get rid of；by | B．be rid of；by | C．rid；of | D．get rid；of |
Only after the woman had her own child ______how difficult it was to be a mother.
| A．she realized | B．had she realized | C．she had realized | D．did she realize |