China sent up two manned spaceships and they were also great scientific _______ in the world.

A．campaigns

B．surprises

C．achievements

D．discoveries

At times the balance in nature is____, resulting in a number of possibly unforeseen effects.

A．confused

B．puzzled

C．disturbed

D．troubled

Lots of waste has been dumped into the river，which has led to________.

A．lots of fish having been killed	B．kill lots of fish
C．lots of fish being killed	D．lots of fish to kill

--I’d like to invite you to dinner this Saturday.
--_______.

A．Oh, no, let’s not	B．I’d rather stay at home
C．I’m very sorry, but I have other plan	D．Oh, no. That’ll be too much trouble.

根据会话情景和内容，从对话所给定选项中选出能填入每一空白处的最佳选项
--­­--What is on at the Capital Theatre tonight?
----   【小题1】   Let’s look at the evening newspaper on page 14.
----Oh, I’ve got it. Tonight is Sister Carrie, and tomorrow is Tea House. Which play do you like best?
----   【小题2】   How about you ?
----   【小题3】  , so I like to see the new play Sister Carrie. By the way, when does it start?
---- At 8:00 p.m.
---- Good, we have two hours then. How can we get there?
----   【小题4】   
----It will take us one and a half hours,  【小题5】   How about by taxi?
----I’m afraid there might be a heavy traffic jam.
I’ve seen Teahouse many times.
We can take the bus.
I like both of them.
So we won’t have much time to buy tickets.
I know it very well.
I’m not sure.
I like neither of them.