--Will you go home tomorrow morning?

--No, I'm planning _____.

[　　]

A．on　　　B．to

C．so　　　D．it

He made another wonderful discovery, _____ of great importance to science.

[　　]

A．which I think is　　　　B．which I think it is

C．which I think it　　　　D．I think which is

We don't think there is anything of interest in your pictures, _____?

[　　]

A．do we　　　　B．don't we

C．is there　　　 D．isn't there

　　--Is there anything you want from town?

　　--No, thank you. But I would like to get _____.

[　　]

A．those letters mailed　　　　　　B．mailed letters

C．to mail those letters　　　　　　D．those letters mail

An awful accident _____, however, occur the other day.

[　　]

A．does　　　　　　B．did

C．has to　　　　　　D．had to

Don't worry, we've still got three days _____ before the work is done.

[　　]

A．hand in hand　　　　　B．at hand

C．by hand　　　　　　　D．in hand

--Hi, Tray, you look tired.

--I am tired. I _____ the living room all day.

[　　]

A．painted　　　　　　　　　B．had painted

C．have been painting　　　　D．have painted

Now then, children. It's time you _____ washed and dressed.

[　　]

A．will be　　　　B．must be

C．be　　　　　　D．were

An awful accident _____, however, occur the other day.

[　　]

A．does　　　B．did

C．has to　　D．had to

When _____, the museum will be open to the public next year.

[　　]

A．completed　　　　　B．completing

C．being completed　　D．to be completed