You ________ pay too much attention to your reading skill, as it is so important.
20.American women usually identify their best friend as someone ____ they can talk frequently.
19.There are two buildings, ____ stands nearly a hundred feet high.
18.When we were young, every evening we ____ stay at home waiting for our mother.
17. — I’m sorry. I ____ hurt you. — Forget it.
16. —Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure.