Teachers required that all the students ___ their homework all alone.
| A．must finish | B． would finish | C．had to finish | D．finish |
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The
weather in this area is generally warm，but it be very cold sometimes．
| A．must | B．can | C．should | D．need |
Not everyone is equal to the task because it special skills and much patience．
| A．calls for | B．calls out | C．turns into | D．turns up |
The experiment turned out to be very successful， was more than we could expect．
| A．what | B．that | C．which | D．this |
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