--The prison was ___________ fire last night.
--Someone must have set fire___________ it.
| A．on ; with | B．on ; to | C．over; with | D．should |
He wrote many children’ s books, nearly half of____ were published in the 1990s.
| A．whom | B．which | C．them | D．That |
In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.
| A．will have been | B．will be |
| C．was | D．has been |
Yoube Carol. You haven't changed a bit after all these years.
| A． | must | B． | can | C． | will | D． | shall |
Like ancient sailors, birds can find their way____ the sun and the stars.
| A．used | B．having used | C．using | D．use |
Last year was the warmest year on record, with global temperature 0.68 ℃the average.
| A． | below | B． | on | C． | at | D． | above |