The time is drawing near _____ food raised in space will directly benefit humans below.
| A．where | B．when | C．whether | D．why |
. With two months _______,we'll have to say good-bye for our school life will be ending.
| A．going | B．gone | C．goes | D．to go |
—The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
—Oh, dear! She _______ a lot of difficulties!
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |
It was in the lab, _______ was taken charge of by Mrs Smith, they found the missing necklace.
| A．where; that | B．that; that | C．which; that | D．which; where |
_______ for his action on the playground, but he is also famous for the things that he does off the playground.
| A．Not he is only known | B．Not only is he known |
| C．Only is he known not | D．He is only not known |
I'm moving to the countryside because the air there is much fresher than _______ in the city.
| A．ones | B．one | C．that | D．those |