American English has so many _________ because the American people have come from all over the world.
A. grammar B. vocabulary
C. pronunciations D. dialects
A large number of students in our school ____ from the countryside; the number _____ growing these years.
A. is; has been B. are; has been
C. is; have been D. are; have been
He looked at the envelope and __________ Jenny’s handwriting immediately.
A. understood B. knew
C. recognized D. recovered
It is said that more than ten thousand workers have ______ the strike(罢工).
A. joined B. joined in
C. attended D. take part
This exam is very difficult. Many students are concerned ________the results.
A. about B. with C. in D. of
— Can you help me _________ all the money that I should pay?
— Very sorry. Please wait a minute, madam.
A. add up B. add up to C. add to D. add together
