Don’t use water to put out the fire if oil catches fire. As is known, oil ____ float on water.
| A．shall | B．must | C．may | D．will |
The rainy weather lasted for a couple of days, completely _______ our plan for a picnic.
| A．being ruined | B．to ruin |
| C．ruined | D．ruining |
My grandpa has been enjoying good health ever since he _______ smoking.
| A．stops | B．stopped |
| C．has stopped | D．had stopped |
Working in the kitchen for years made Alice ______ a good cook．
| A．for | B．into | C．of | D．as |
Don’t respond to any e-mails ______ personal information, no matter how official they look．
| A．requested | B．request |
| C．requesting | D．to be requested |
—Hi, Albert, I can’t find my reference book!
—Sorry, I ______ it and I guess I put it on the top shelf with my things．
| A．use | B．had used |
| C．am using | D．used |