14. The window __________ by the boy.
A. has carelessly been broken
B. have carelessly been broken
C. has been carelessly broken
D. have been carelessly broken
16. The teacher needs _______ her students.
A. to believe
B. to be believed
C. believing
D. believed
17. The key was found __________.
A. in the closet by his brother yesterday
B. yesterday by his brother in the closet
C. in the closet by his brother tomorrow
D. tomorrow by his brother in the closet
18. It is quite expensive, but this detergent __________ better than the cheaper ones ever since it __________ to the market.
A. has been sold / introduced
B. sells / has introduced
C. was sold /been introduced
D. has been selling / was introduced
19. The towel doesn’t need _______.
A. being washed
B. washing
C. to wash
D. washed