Look,the boy can .
—Do you know Robert? —Yes, He is__ university student. He likes sports and runs for ___ hour every morning. A a; a B a; an C an; an D an; a
They stayed in Beijing for a few days and visited some ________.
If you have headaches often, you need _______ .
He wasn’t _____ to understand the questions.
The strong young man can swim ______ the river.