Cars play an important role in modem life, but they also cause many problems like air pollution.
| A．should | B．can | C．must | D．will |
Up till now, more than 120 world-famous enterprises ______ companies in Tianjin Binhai New Area.
| A．have established | B．established | C．will establish | D．have been established |
He came to a point ______ there was no more road to follow, and before him he could see nothing but a thick forest.
| A．that | B．what | C．which | D．where |
--- I had been worried about English before the final exam, but I got an A!
--- ______.
| A．Wish you good luck | B．Sounds great |
| C．Congratulations | D．You shouldn’t have worried about it |
I just can’t understand ______ that makes so many young people addicted to playing online games.
| A．what it is | B．what is it | C．why it is | D．why is it |
He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.
| A．even thought | B．as if | C．so that | D．in case |