Mum，you really need to have a rest！You ________in the kitchen ever since you came back home three hours ago.
| A．had worked | B．were working |
| C．have been working | D．worked |
---- I’m going to Betty’s birthday party. Bye-bye, Mom.
---- ____, baby.
| A．Best wishes | B．Have fun | C．Take care | D．No problem |
He is a kind-hearted boy and he will come to the Old Folks' Home whenever __________.
| A．he is convenient | B．he will be convenient |
| C．it is convenient to him | D．it will be convenient to him |
I can think of many cases______ the media have a strong effect on young men.
| A．why | B．where | C．as | D．which |
–It is said that Bob will drop out of school because his family cannot afford the school fee.
– _____, let’s give him a hand.
| A．If so | B．If only | C．Where necessary | D．Where possible |
Despite their______of interest, Fleming kept trying to develop chemical______ it would be safe and effective.
| A．lack, so as to | B．lacking, so as to |
| C．lack, so that | D．lacking, so that |