You must have made the mistake,_______?
| A．mustn't you |
| B．haven't you |
| C．didn't you |
| D．hadn't you |
Don't handle the vase as if it ________ made of steel.
| A．is | B．were |
| C．has been | D．had been |
Jack is a great talker. It's high time that he ________ something instead of just talking.
| A．will do | B．has done |
| C．do | D．did |
—Where are the children? The dinner's going to be completely ruined.
—I wish they______always late.
| A．weren't | B．hadn't been |
| C．wouldn't be | D．wouldn't have been |
Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
| A．was | B．be |
| C．were | D．is |
Had they known what was coming next, they ________ second thoughts.
| A．may have | B．could have |
| C．must have had | D．might have had |