Carbon dioxide，which makes a________between us and the sun，prevents heat from getting out of the atmosphere easily，so the earth is becoming warmer.
| A．difference | B．comparison |
| C．connection | D．barrier |
As he never raises a finger to help me with the dinner, Ithe thanksgiving meal from this afternoon till now.
| A．have been preparing | B．prepared |
| C．had been preparing | D．prepare |
Senior high school student as he is, he finds it a difficult timeas a grown-up by his parents.
| A．treating | B．to be treated |
| C．being treated | D．to treat |
—Believe it or not! I should get my lost wallet back after I left it in the taxi this morning.
—Couldn’t agree more! You know, someone _______ it. There are still good persons in Chongqing.
| A．can have taken | B．might have taken |
| C．should have taken | D．must have taken |
_______ impressed me was the well-known young author, Guo Jingming’s amazing try of directing a movie Tiny Times, which was based on one of his bestseller novels.
| A．Which | B．What | C．It | D．That |
Humans’ activities have pushed some endangered animals into a situationwe will probably never see them.
| A．that | B．what | C．where | D．which |