---What can I do for you, sir?
--- I want _______apple juice and _____apple.
A.／; an B. an; an C. a; a
Sam spends two hours _______ his homework every day.
A. to do B. doing C. do
—How often are the Olympics Games held? — __________.
A. Every year
B. Every four year
C. Every four years
— _______ do you prefer, walking or running? —I like running better.
A. Which B. How C. When
—What’s the matter with you? — I have _____cold
A.the B. a C. /
I _________ what you are doing now.
| A．wonder | B．act | C．try | D．feel |