Your mother has been________you so much．You should not________her any more．

A．worried; worry

B．worried about; worry

C．worried; worry about

D．worried about; worry about

She tried her best to encourage him not to lose heart whenever possible．She was sure that her husband would ________it．

A．agree

B．practise

C．succeed

D．accept

The old man often advised the young workers on ________the machine and they learned quickly．

A．to operate

B．how operate

C．how operating

D．how to operate

There are five pairs________ , but I’m at a loss which to buy．

A．to be chosen

B．to choose from

C．to choose

D．for choosing

Never download or ________ files from sites you’re not 100 percent sure of－in other words, don’t ________ candy from strangers．

A．accept; receive

B．receive; accep

C．accept; accept

D．receive; receive

The expected results ________ he had worked hard seemed hopeless to him．

A．after which

B．for which

C．with which

D．at which

I ________ have been more than six years old when the accident happened．

A．shouldn’t

B．couldn’t

C．mustn’t

D．needn’t

The day ________ you are looking forward to will certainly come．

A．in which

B．when

C．which

D．what

Is this the year ________ they fought a battle against flood?

A．at when

B．which

C．when

D．why

I can still remember the sitting-room ________ my mother and I used to sit in the evening．

A．which

B．what

C．that

D．where