At last the boss_____to the workers' demand and offered better pay and working conditions.
| A．gave away | B．gave in |
| C．gave up | D．gave off |
Suddenly the idea came to me I might turn to Mr. Smith for help.
| A．what | B．that | C．which | D．whom |
It is still unknown_______ caused the accident last Saturday.
| A．that | B．when | C．what | D．how |
____ wants to stay in a hotel has to pay their own.
| A．Anyone | B．The one | C．Whoever | D．Who |
The experiment shows that proper amounts of exercise ,if _______regularly, can improve our health.
| A．being carried out | B．carrying out | C．carried out | D．to carry out |
It is one of the funniest things ____on the Internet so far this year.
| A．finding | B．being found | C．to find | D．found |