I ___________ on the computer when Frank called me last night.
A.work B.will work C.was working D.am working
If you take this train, you _________ in Shanghai in five hours.
A.arrive B.will arrive C.arrived D.have arrived
Zhaozhou Bridge is one of ________ stone bridges in the world.
A.old B.older C.oldest D.the oldest
—______________ do you visit your grandparents, Tom?
—Twice a month.
A.How much B.How often C.How long D.How soon
—________ you give me a hand? I can't move the box by myself.
—No problem.
A.Could B.Should C.Must D.Need
Wash your hands before meals, ________ you may get ill.
A.and B.but C.or D.so
