Mary was only too ready to help others, seldom, ______, refusing them when they turned to him.
| A．if never | B．if not | C．if any | D．if ever |
--Who______ it be that is knocking at the door?
--It ______ be Father, but I’m not sure.
| A．can; may | B．can; must |
| C．must; can | D．may; must |
Judging from his______ expression, this problem must be quite ______.
| A．puzzling; puzzling | B．puzzled; puzzled |
| C．puzzling; puzzled | D．puzzled; puzzling |
Listen! Do you hear someone _____ for help?
| A．calling | B．call | C．to call | D．called |
--How is your cousin, Kate?
--She broke her leg and ______ medical treatment since.
| A．is receiving | B．has received |
| C．received | D．has been receiving |
--Mom, may I play computer games just for a while?
--______! Dad is writing his paper.
| A．Help yourself |
| B．It's up to you |
| C．Go ahead |
| D．Behave yourself |