--- How come your father can read books in German? --- Well, he____on a project with some German engineers for 3 years when he was young.
It is hard to say what kind of person he is. Sometimes he is very friendly; at other times he ___ be very cold.
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.
—“Do you mind if I look at your notes?” —“Of course not. _______.”
Afghans used to hold big weddings, costing thousands of dollars, in a county _____ the average annual income is less than $400.
She ought to stop work; she has a headache because she ___________ too long.