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
______ get a better score, she has been studying hard all day.
A. So as to B. In order to
C. So that D. In order that
It is important to keep ______ in an emergency (紧急情况).
A. quiet B. calm C. silent D. still
