It is known to us all E-mail is______ efficient than sending a fax.

Soon after the quakes，one thousand soldiers were sent out to the miners from the local coal mine.

I didn’t know you take a bus to school.-Oh, Itakea bus, but it is snowing now.

In my view, biology is ________ chemistry, but a little easier than mathematics.

We should get prepared for dealing with ________problems_________.