You are silly not your door.
| A．to lock | B．to have locked | C．locking | D．having locked |
Each new way of looking at a situation deepens our understanding and makes ______ easier to discover new possibilities.
| A．this | B．it | C．one | D．that |
Why not stay at home ______ the road is so slippery after the heavy snow?
| A．so long as | B．in case | C．so far as | D．now that |
It is such ______ honor to take part in ______ celebration, so how could I make any mistake?
| A．an; / | B．the; the | C．an; the | D．/; the |
At the conference, Premier Li Keqiang urged all the government departments ______ effective measures to improve work efficiency.
| A．took | B．must take | C．take | D．are to take |
_______to sunlight for too much time will do harm to one’s skin.
| A．Being exposed | B．Having exposed | C．Exposed | D．After being exposed |