It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
| A．shall | B．will | C．need | D．may |
The problem is not _____ easy. Think _____ over.
| A．such, it | B．that, it | C．so,不填 | D．that，不填 |
It is so difficult a problem that _____ student in this class _____ work it out.
| A．any, can't | B．no, can | C．every, can | D．no, can't |
Mr Zhang gave all the textbooks to all the pupils , except _____ who had already taken them .
| A．these | B．ones | C．the ones | D．the others |
Besides Tom , ______ Crosettes have two other sons , ______ of whom are all interested in making model planes .
| A．不填；two | B．不填；the two | C．the ; three | D．the ; the three |
Shortly after the accident , two ______ police were sent to the spot to keep order .
| A．dozens of | B．dozens | C．dozen of | D．dozen |