Stephen Hawking is from _________.A. the U.S.A. B. Japan C. England D. Canada
We must pay attention to _______ the teacher carefully in class.
We __________for a picnic if it ___________this Sunday.
The house ________ in1950.
The book _______ my husband bought in Shenzhen yesterday was very interesting.
Four thousand kilometers _________ not a short distance.