The scientists are studying the effects of human activities______the environment.
| A．in | B．at | C．on | D．with |
Don’t defend him any more. It’s obvious that he ______ destroyed the fence of the garden even without apology.
| A．accidentally | B．carelessly | C．deliberately | D．clumsily |
---It rained cats and dogs this morning. I’m glad we took an umbrella.
---Yeah, we would have got wet all over if we ______.
| A．haven’t | B．didn’t | C．don’t | D．hadn’t |
_____ we have enough evidence, we can’t win the case.
| A．Once | B．As long as | C．Unless | D．Since |
______ which university to attend, the girl asked her teacher for advice.
| A．Not knowing | B．Knowing not | C．Not known | D．Known not |
--- Red or white wine, Bob?
--- Oh, either.________. It doesn’t matter to me.
| A．That’s ok | B．I’m sorry | C．It’s a pity | D．It’s up to you |