It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
A. when B. that C. which D. what
The last bus _________ two minutes before I arrived at the bus stop. What a pity!
A. left B. has left
C. was leaving D. had left
A new subway ________ in Changsha and it will be open to traffic when completed next year.
A. has built B. has been built
C. is building D. is being built
My parents always ________ great importance ______ receiving good education.
A. pay; back B. apply; to
C. attach; to D. get; across
The film star wears sunglasses. ________, he can go shopping without being recognized by fans.
A. Therefore B. However
C. Otherwise D. Besides
Studies indicate that people are more _______ to suffer from back problems if they sit before computer screens for long hours.
A. possible B. likely C. sure D. certain
