_____ his knowledge of the mountainous country, John Smith was appointed as our guide.
| A．In spite of | B．On account of |
| C．Regardless of | D．Instead of |
Beijing has struggled with smog for years，which has__________ the sun and affected the health and quality of life of millions.
| A．driven away | B．pushed out | C．broken off | D．blocked off |
Between the lectures is a 20 minutes’break，__________the students can get relaxed.
| A．that | B．which | C．where | D．when |
The speech from the new government is a __________ that major changes are on the way．
| A．notice | B．feature | C．signal | D．mark |
一How did you manage to succeed?
一It is only after we've lost everything __________we're free to do anything.
| A．when | B．that | C．which | D．what |
Mum__________ me to school as she knew it was important for me to receive education，but we were so poor then．
| A．had sent | B．sent | C．would have sent | D．would send |