In those days, we had no phones, so we have to keep in touch _____ writing often.
He has been acting strangely these days. I can’t________ his actions at all.
Prices of the basic necessities of life have been going up sharply since word came that war would________ between the two countries soon.
—We don’t permit____ in our school. Would you please put your cigarette out?—Forgive me. I didn’t know.
_______ she came for school late is that she missed the early bus.
The telephone rang but I didn’t hear it. I _______ asleep.