Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
The water _______cool when I jumped into the pool for morning exercise.
— What’s the matter with you? —______the heavy suitcase, my waist was hurt unexpectedly.
I hear they’ve promoted Tom, but he didn’t mention_______ when we talked on the phone.
The situation seems to be better, and I suppose it is because of the war ______ to an end.
The young man _______in studying paid no attention to the outside world.