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－This physics problem is too difficult．Can you show me ________, please Wang Lin?

－Sure．

A．what to work it out

B．what to work out it

C．how to work it out

D．how to work out it

I’m going to a field trip but I haven’t decided ________．

A．what to do

B．to do what

C．where to go

D．to go where

－Jack seems like a good student．

－He is always the first ________ his work．

A．finishes

B．finishing

C．finished

D．to finish

The Chinese ping-pong players will join in the match．Let’s ________ them success．

A．wish

B．to wish

C．hope

D．to hope

We saw him ________ the building and go upstairs．

A．to enter

B．enter

C．entering

D．entered

Helen wasn’t feeling well．I told her ________ in bed till supper time．

A．stayed

B．stay

C．staying

D．to stay

Not only your father but also you ________ going to the History Museum．

A．is

B．am

C．are

D．will

－The windows need washing．

－Well , let’s wash them together, ________?

A．shall we

B．will you

C．should we

D．would you

There is nothing we can do, ________?

A．is there

B．can’t we

C．isn’t there

D．can we

Young men shouldn’t waste much time in playing the computer games, ________?

A．didn’t they

B．did they

C．should they

D．shouldn’t they