（题文）When Mary didn't find her mother, she began to cry and ________ her.
A. look for B. look after
C. look at D. look out
—Will there be more people in 100 years?
—________.
A. No, there isn't B. No, there aren't
C. No, there won't D. No, they won't
Some old houses ________ in my hometown last summer.
A. fall down B. fell down C. write down D. wrote down
—How was your vacation in America?
—It couldn't be worse! I don't ________ want to talk about it.
A. even B. hardly
C. ever D. mainly
The man is a famous musician. He has written ________ of songs for the singers.
A. hundred B. hundreds
C. a hundred D. two hundreds
Listen! Someone is calling for help. He must be ________.
A. in the danger B. in danger
C. out of danger D. dangerous
