Every possible means _______to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
Mr Smith likes traveling _______ ，but his wife enjoy _______ .
| A．by train; taking a taxi | B．on train; by taxi |
| C．by train; by taxi | D．on train; taking a taxi |
I walked up to the top of the hill with my friends, _____ we enjoyed a lovely view of the lake.
| A．which | B．where | C．who | D．that |
---Don't put the waste on the ground.
---Oh, I'm very sorry. I ________ the dustbin（垃圾箱） there.
| A．don't see | B．isn't seeing | C．didn't see | D．haven't seen |
---Whose advice do you think I should take?
--- ________ .
| A．You speak | B．That's it | C．It's up to you | D．You got it |
We were pretty _____ when we learned the _______ fact that an elephant would come to live in our school.
| A．amazing, amazing | B．amazed, amazed |
| C．amazing, amazed | D．amazed, amazing |