I didn’t go outing on National Day because the bad weather ______ the difficulty.
| A．added up | B．added | C．added up to | D．added to |
Many citizens urged their government to take measures to _______ their carbon emission to reduce greenhouse effects.
| A．cut off | B．cut up | C．cut out | D．cut down |
Obama made _______ history by being elected as ________ first black president of the US.
| A．不填；the | B．a; the | C．a; a | D．the; a |
--I think our school’s selective courses are of great use and I have learnt a lot from them.
--Yes _______.
| A．No problem | B．I couldn’t agree with you more |
| C．I don’t think so | D．It doesn’t matter |
I was born in New Orleans, Louisiana, a city _______ name will create a picture of beautiful trees and green grass in our mind.
| A．which | B．of which | C．that | D．whose |
_______ he was the last man I wanted to see, I did all that I could to help him.
| A．As | B．Now that | C．While | D．As though |