Two-thirds of the coins dug up on the island ________ from the year 275AD to 221BC.
A. dates B. date
C. is dated D. are dated
There is only one of the oldest customs that ________ in this district up to now.
A. was kept B. were kept
C. has been kept D. have been kept
Modern teaching equipment as well as tens of computers _______ to the village school last week.
A. were sent B. was sent
C. has sent D. had been sent
The number of air crashes that _______ in developing countries _________ increasing.
A. happens; is B. happen; is
C. happens; are D. happen; are
Bill suggested ________ a meeting on what to do for the Shanghai Expo during the vacation.
A. having held B. to hold
C. holding D. hold
_________many times, he finally understood it.
A. Told B. Telling
C. Having been told D. Having told
