Both of my parents insisted _______ a computer for me, but I don’t think it is necessary.
| A．to buy | B．buying |
| C．on buying | D．in buying |
--- Hey, Mary, your backpack looks nice. When did you buy it.
--- I ____ it for two weeks.
| A．had | B．bought |
| C．have had | D．have bought |
The snowstorm ________ our difficulties.
| A．added to | B．added up |
| C．added up to | D．has added |
．Why do you insist on buying a car ______ you have such good public transportation here?
| A．because | B．unless |
| C．when | D．though |
Thomas wants to know ______Nina lives.
| A．where | B．who |
| C．what | D．if |
Mr. Smith couldn’t open the door because his naughty boy _______ it from the inside
| A．would lock | B．was locking |
| C．has locked | D．had locked |