--- Look!Somebody ___ the sofa.
--- Well,it wasn’t me. I didn’t do it.
| A．is cleaning | B．was cleaning |
| C．has cleaned | D．had cleaned |
So although Fleming discovered penicillin, it was over a decade ___________someone else turned penicillin into the great drug of the 20th century.
| A．when | B．that | C．before | D．unless |
Hardly __________ the Shanghai Expo _________ we realized we forgot our ID cards in the room.
| A．we had got to ; that | B．we got to ; when |
| C．had we got to ; when | D．had we got to ;than |
________in the heart of Toronto is the Canadian National Tower , which is often called the CN Tower for short.
| A．Locating | B．Located | C．Having been located | D．Having located |
. Emergency line operators must always ________calm and make sure that they get all the information they need to send help.
| A．grow | B．appear | C．become | D．stay |
.Toyota Motor President Akio Toyoda on Monday apologized to Chinese consumers, who ________ the world's biggest auto market, over the company's massive global recall.
| A．make up | B．bring up | C．put down | D．set down |