— Smoking is really bad for health.
— Teenagers in our school have _______ they will refuse the first cigarette.(香烟)
| A．provided | B．produced | C．proved | D．promised |
I love the singers _______ write their own songs.
A. whom B. whose C. who
________ interesting story it is! We all fall in love with it.
A. HowB. What a C. What an
When we got to the hospital, Mary _______ there.
A. left B. has leftC. had left
Students are supposed _______ school uniforms on school days.
A. wear B. to wear C. wearing
—When ________ the telephone ________?
—In 1876.
A. is; invented
B. did; invented
C. was; invented