— Dad, must we wait for the green light? — Yes, I’m afraid we ________. That’s the traffic rule (规则).
----does your sister surf the internet? ---- About once a week.
Mr. Green ___ to the manager now. You’d better call him later.
Please ___ your homework to school tomorrow, Tom. --- OK, Mr. Li.
Where is Jim? --- He is sending an email ___ his friend.
Please help him ___ these books to the classroom.