— Work hard, _________ you’ll pass the exam.
— OK. I’ll try my best.
A. or B. and C. but
—is the bus station from Tian’anmen Square?
—About thirty minutes’ ride.
A. How long B. How far C. How much
The old woman often feelsbecause she has no children.
A. alone; live with B. lonely; to live with C. lonely; to live
Tom never does his homeworkMary. He always makes lots of mistakes.
A. as carefully as B. carefully as C. as careful as
—Did youyour pen friend yesterday?
—Yes. He told me he would to on a visit to America.
A. hear about B. hear from C. hear of
The following are all traffic signs except.