Please remind your grandpa to take medicine on time, for a man of his age ____be very forgetful．
| A．need | B．must | C．shall | D．can |
The grain output is 8 percent higher this year than _______ of last year.
| A．that | B．the one | C．one | D．those |
His luggage includes two large cases which ________ as much as 50kg.
| A．weighs | B．is weighed | C．weigh | D．are weighed |
-Why didn’t you go to the party ?
_______ an invitation, I would have gone to the party .
| A．Had I received | B．If I received |
| C．If I should receive | D．Were I to receive |
_______ I admit that the problems are difficult , I don’t agree that they can’t be solved .
| A．In case | B．As | C．Because | D．While |
There are fifty students in our class, ______ are girls .
| A．most of them | B．most of whom |
| C．most of who | D．most of which |