Someone who lacks staying power and perseverance is unlikely to ___ a good researcher. 
| A．make | B．turn | C．get | D．grow |
It _____ Jane and Mary who helped me the other day.
| A．is | B．was | C．are | D．were |
I _____ to bed when the telephone rang.
| A．have been | B．went | C．am going | D．was going |
Jane _____ some washing this time yesterday.
| A．is doing | B．had done | C．was doing | D．did |
When I got to the school, the first class _____.
| A．had begun | B．began | C．is beginning | D．has begun |
Mother promised she _____ me an English-Chinese dictionary.
| A．is buying | B．will buy | C．would buy | D．has bought |