20.This is the small house less than 15 square meters,under _____ roof lives a large family of three generations.
| A．which | B．that | C．its | D．whose |
In order to learn the _______ of the family business, Bill took a job as messenger boy in one of the offices.
| A．ins and outs | B．dos and don’ts | C．heads and tails | D．p’s and q’s |
Jim was late for two classes this morning. He said that he forgot both of the ______.
| A．rooms’ number | B．room number | C．room’s numbers | D．room numbers |
You’ve just missed your ______, and you will have to wait for the next round.
| A．chance | B．turn | C．time | D．round |
His letter was so confusing that I could hardly make any ______ of it.
| A．use | B．meaning | C．sense | D．guess |
She had prepared carefully for her English examination so that she could be sure of passing it on her first ________.
| A．try | B．attempt | C．purpose | D．hope |