We have to __________finding a solution.
| A．set about | B．set down | C．set out | D．set up |
Rather than _____on a crowded bus, he always prefers _____a bicycle.
| A．to go; riding | B．to go; to ride | C．go; ride | D．go; to ride |
---Hi, Tracy, you looked tired.
---I am tired. I______the living room all day.
| A．painted | B．had painted | C．having been painting | D．have painted |
______I understand your viewpoint, I don’t agree with it.
| A．Unless | B．Since | C．Before | D．While |
Do you know when the Great Wall _________?
| A．was come into being | B．came into being |
| C．had come into being | D．had been come into being |
He tried his best to solve the problem, _______difficult it was.
| A．no matter | B．no matter how | C．whatever | D．although |