一. 单项选择（ 15*1=15）
Mrs Read had a long_____ with Sally in her office this morning.
A.conversation B.conclusion C.organization D.introduction
I think WeChat makes ______ easier and cheaper for people to keep in touch.
A.it B.one C.that D.this
3. The poor boy was born _____a kind of illness.He needs our help.
on B.in C.of D.with
4. Some of the problems of living in the sea are similar to____of living in outer
space.
this B.that C.these D.those
