_______ to the sunlight for too long will do harm to your skin.
| A．Exposing | B．Exposed | C．Being exposed | D．Having exposed |
The number of people invited ___ fifty, but a number of them ___ absent for different reasons.
| A．were, was | B．was; was | C．was; were | D．were; were |
Many people agree that ___ knowledge of English is a must in ___ internationsl trade today.
| A．a;/ | B．the;an | C．the; the | D．/; the |
Tom felt that he knew everybody’s business better than they knew it___.
| A．themselves | B．oneself | C．itself | D．himself |
John, you ___ play with the knife, you __ hurt yourself.
| A．won’t; can’t | B．mustn’t; may | C．shouldn’t; must | D．can’t; shouldn’t |
---When shall we meet again?---Make it ___day you like;it’s all the same to me.
| A．one | B．any | C．another | D．some |