is more important is as the earth cooled down, water began to appear on its surface.

      is more important is      as the earth cooled down, water began to appear on its surface.

#30116

What /that

That/what

What / what

That / that

推荐题目

I’m sorry, _________ I won’t be able to come tonight.

#79840

for

and

but

then

All people,     they are old or young, rich or poor, have been trying their best to help those in need since the disaster.

#79731

even if

whether

no matter

however

—What upsets him?—________ his computer is out of order.

#30313

Whether

What

That

How

He said ______ couldn’t he work out the problem but his teacher didn’t know how to do it.

#80569

though

never

hardly

not only

__________ the kids have left home,  we’ve got a lot of extra space.

#33149

As soon as

While

Now that

Before