The student did what they ___ the old man.
| A．could help | B．could helping | C．could to help | D．might help |
He has never visited the Great Hall of the people, _________?
| A．hasn't he | B．has he | C．does | D．doesn't he |
A number of sheep _________ seen by us when we passed the field..
| A．is | B．are | C．was | D．were |
Both Kate and I _________ ready for the picnic now.
| A．is not | B．is getting | C．are getting | D．am getting |
A boy with two dogs _______ when the earthquake rocked the city.
| A．were sleeping | B．is asleep | C．was sleeping | D．are asleep |
Andy has _______ for five years. Five years _________ a long time.
| A．come back home, is | B．come back home, are |
| C．been at home, is | D．been at home, are |