I _____ all the cooking for my family, but recently I’ve been too busy to do it.
| A．will do | B．am doing | C．do | D．had done |
— No one can answer the question _______ we can complete the task in time, do you know?
— Yes, and this is because we don’t know the way _______ the scientist used last time．
| A．whether; which | B．if; which |
| C．whether; in which | D．if; in which |
— ____ visited the Shanghai World Expo is sure to tell you the place is worthy ____ twice．
— You can say that again．
| A．Those who have; visiting | B．Whoever has; visiting |
| C．Those who have; to be visited | D．Whoever has; to be visited |
— Do you know the tower _____ in the heart of the city?
— Do you mean the one _____ to the north of the city library?
| A．locating; lay | B．located; lying |
| C．being located; lying | D．located; lay |
Canada is one of _____ largest countries in the world, ______ second only to Russia．
| A．the; the | B．the; a |
| C．a; the | D．the; 不填 |
The telephone _____ three times in the last hour, and each time it _____ for my sister.
| A．had rung; was | B．has rung; was | C．rang; has been | D．has been ringing; is |