— What did Bob ask you just now?
— He wanted to know how long Mr. Jiao________.
A.had been away B.left C.had left
— Where did you get these old doors?
— From the old houses which were________by the workers.
A.taken down B.pulled down C.turned down
Lisa remembers________to her mother. But her mother hasn’t received the letter.
A.to write B.wrote C.writing
China has a history of more than five ________years.
A.thousands of B.thousands C.thousand
The main difference between our brains and those of monkeys is that ________are much bigger and smarter.
A.us B.ours C.we
We need to follow the expert’s ________so that we can stay safe.
A.instructions B.inspiration C.instruments
