With a lot of difficult problems ________ , the headmaster is having a hard time．

A．settle

B．settling

C．to settle

D．being settled

Put everything ________ to you in your bag, not others．

A．belongs

B．belonged

C．belonging

D．to belong

Not until he called the secretary three times ________ that the manager went to an important meeting．

A．did he tell

B．he told

C．was he told

D．he was told

________ I'm willing to help, I do not have much time available．

A．When

B．As

C．While

D．Before

She was busy marking the papers all the morning, only breaking off ________ to have some tea．

A．occasionally

B．rarely

C．constantly

D．frequently

________ great progress you have made, you should remain modest(谦虚的)．

A．Even if

B．However

C．Whatever

D．No matter

There's no greater happiness in the world than ________ of succeeding in one's career．

A．that

B．it

C．one

D．those

Mike went to Beijing in his twenties, ________ some years later, he became a successful editor．

A．when

B．where

C．that

D．which

I went shopping in the supermarket yesterday．The lift ________ and we were trapped inside．

A．broke up

B．broke into

C．broke down

D．broke out

Tom is always the first student in our class ________ his hand whenever our teacher asks a question．

A．raise

B．raised

C．to raise

D．having raised