Several weeks had gone ________ I realized the painting was missing．

A．as

B．before

C．since

D．when

It shames me to say it, but I told a lie when ________ at the meeting．

A．questioning

B．being questioned

C．questioned

D．to be questioned

－What were you doing when Tony phoned you?

－I had just finished my work and ________ to take a shower．

A．had started

B．started

C．have started

D．was starting

－________ a second time, will the man have one more try?

－I’m sure he will．

A．Turn down

B．If turning down

C．To turn down

D．If turned down

The fact ________ he didn’t recognize me means that I ________ a lot in the past few years．

A．that; changed

B．which; had changed

C．when; changed

D．that; have changed

Let us suppose that you are in ________ position of ________ parent．Would you allow your children to do such a thing?

A．a; a

B．a; the

C．the; a

D．the; the

The education of ________ young is always ________ hot and serious topic in the modern society．

A．the; 不填

B．the; a

C．不填；the

D．a; the

The factory had to ________ a number of employees because of economic decline in the country．

A．lay out

B．lay off

C．lay aside

D．lay down

Their house ________ have been sold, but I have not been told about it．

A．must

B．may

C．shouldn’t

D．needn’t

________ of the burden of ice, the balloon climbed up and drifted to the south．

A．To be free

B．Freeing

C．To free

D．Freed