In addition to the farming they ______ since the 1990s, the Smiths have started a small business.
| A．have done | B．had been done |
| C．were doing | D．have been doing |
—— It’s been raining for a whole week. I think it’ll get fine soon.
—— We’re getting into the rainy season now.
| A．Of course not. | B．It’s hard to say. | C．Yes, it will. | D．It’s possible. |
It is important that we wild animals.
| A. will protect |
B. should protect |
C. shall protect |
D. are protecting |
I do every single bit of housework ______ my husband Bob just does the dishes now and then．
| A．since | B．while | C．when | D．as |
The Great Wall, _____ to be the longest wall in the world, runs across China like a huge dragon．
| A．saying | B．to say | C．said | D．being said |
It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
| A．which | B．what | C．that | D．when |