In much of the animal world, night is the time ____ for sleep —pure and simple.
| A．set aside | B．set down | C．set off | D．set up |
The audiencewhen they watched his funny performance.
| A．burst into laughing | B．burst out laughter |
| C．burst into laughter | D．burst in laughing |
Every day we are using so many raw materials which _________that they _________.
| A．are running out; will be used up |
| B．are being run out; will run out |
| C．have run out of; will be using up |
| D．have run out; will run out of |
_______the fierce competition in finding a good job in big cities, many fresh graduates are still trying their fortune in Beijing.
| A．Apart from | B．Regardless of |
| C．Instead of | D．With regard to |
______ the Internet is of great help, I don’t think it is a good idea to spend too much time on it.
| A．Unless | B．Since | C．When | D．While |
The first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.
| A．to have been held | B．having held |
| C．held | D．being held |