Scientists are trying to ways to treat the terrible disease called H7N9.
| A．come up with | B．give in | C．talk about | D．give up |
It’s really cold today, ______ ?
| A．does it | B．doesn’t it |
| C．isn’t it | D．is it |
You look tired, why not ______ a short rest?
| A．have | B．having | C．to have | D．will have |
Would you mind ______ those old jeans?
| A．don’t wear | B．not to wear |
| C．aren’t wearing | D．not wearing |
Mariah used to_____ interested in music, but now she’s used to ____tennis.
| A．be, playing | B．being, play |
| C．be, play | D．being, playing |
He _____ when the UFO arrived.
| A．was sleeping | B．were sleeping |
| C．has slept | D．is asleep |