The USA is a large country in ________ many different dialects are spoken.
The train left _____________.[ ]
Excuse me. _______ your phone number?—13409964858.
If there are _______ people driving, there will be _______ air pollution.—Yes, the air will be fresher.
What’s wrong with you? You look very tired. –I ___________ late to study for the English test last night.