I must be off now．I hope we will ________ each other by letter．

A．communicate with

B．see again

C．meet with

D．write to

In the ________ snow, there is a lot of air．

A．loose

B．loosen

C．lose

D．lost

My English teacher gave me ________ how to study English．

A．an advice on

B．some advice on

C．some advices in

D．an advice in

They want to know ________ do to help us．

A．what can they

B．what they can

C．how can they

D．how they can

Crusoe used to live on ________ island ________．

A．an alone; lonely

B．a lonely; lonely

C．a lonely; alone

D．an alone; alone

After such a ________ climb, the children were all ________ out．

A．tiring; tiring

B．tired; tiring

C．tiring; tired

D．tired; tired

Without ________ he raised his voice．

A．hearing

B．being heard

C．having heard

D．to be hearing

I couldn't watch CCTV news with my TV set wrong．I ________ in time．

A．should repair

B．should have had it repaired

C．must repair

D．must have repaired

The baby cried when its foot ________ the door of the bus．

A．caught on

B．was caught on

C．caught in

D．caught between

There was ________ in history when black slaves could be bought and sold in America．

A．the time

B．a time

C．time

D．any time