It is not_______ for me to return all the books to the library now because I still need them.
A. difficult B. convenient C. available D. important
—Have you known each other for long?
—Not very long, __________ we started to work in the company.
A. after B. before C. when D. since
Typhoon Morakot has caused great _________ to the local economies in Wenzhou.
A. injury B. wound C. ruin D. damage
Mr. Smith would have come to see you if it had been possible, but he __________ so busy.
A. was B. had been C. has been D. were
Generally speaking, ______according to the directions, the drug has no side effect.
A. when taking B. when taken C. when to take D. when to be taken
Please _____all the numbers. Those numbers______10,000.
A. add to , add up B. add up, add up to
C. add up , add to D. add up to, add to
