O’Neal works hard．He is often seen _______heavily before his teammates have even arrived at practice．

Look! That man looks like Mr. Brown.—-It _______be him, for he _____to America.

Why are you in a great hurry, Paul—I have to, _____ I’ll be late for school.

Nowadays many women are _____ their late twenties or early thirties when they have their first child.

We knocked at the door so that we ___be allowed to stay for the night. [ ]