---______is this girl?---she is my sister.----______do you spell “sister”?---S-I-S-T-E-R.
— When shall I hand in my report? — As soon as it ____________ tomorrow.
Some students don’t know how to ____________ stress and become worried.
They had much difficulty ____________ the problem and they needed our help.
You’d better go to bed early. Don’t ____________ too late.
He is very modest and he never ____________.