______ to nuclear radiation, even for a short time, may influence genes in human bodies.
A. Having exposed B. Being exposed
C. To expose D. Exposed
--- Where will you start your work after graduation?
--- Mum, it’s not been decided yet. I ______ continue my study for a higher degree.
A. need B. must
C. would D. might
--- Is it convenient to you if I call you up at 9 o’clock tomorrow morning?
--- I’m afraid not. I ______ a meeting then.
A. will have attended B. was attending
C. will be attending D. am attending
--- Why didn’t you help the little boy?
--- Oh, he had struggled to his feet ______ I could run over and offered any help.
A. before B. after
C. when D. since
The only problem was ______ we kept getting lost! But people in Tianjin are very friendly and helpful.
A. why B. whether
C. that D. how
This restaurant has an inviting, homelike atmosphere ______ many others are short of.
A. where B. when
C. that D. what
