—Why don’t you buy some cakes while doing shopping yesterday afternoon? —Sorry, ____.
| A．I forget | B．I forgot | C．I have forgotten | D．I had forgotten |
23．Nothing taught by others can have the same effect on you as learned by yourself.
| A．that | B．it | C．the one | D．which |
Jack must be helping his grandma to water the flowers,______?
| A．is he | B．isn’t he | C．must he | D．mustn’t he |
— Why are the four students so happy?
—______ in the science competition, they are awarded prize money totaling $ 20,000．
| A．Judged the best | B．Judging the best |
| C．To be judged the best | D．Having judged the best |
The weather turned out to be fine yesterday．You __the trouble to carry your raincoat with you．
| A．should have taken | B．mustn’t have taken |
| C．could have taken | D．needn’t have taken |
The little boy who got lost decided to remain _____ he was and waited for his dad．
| A．what | B．where | C．there | D．what |