Don’t use your mobile phone while charging, ______ you may be shocked by electricity.
A.or B.and C.but D.yet
— Why is the chemical plant closed?
— Because large quantities of waste water ______ into the Yangtze River.
A.has been released B.is being released
C.was released D.have been released
—Lydia, what did our head-teacher say just now?
—Every boy and every girl as well as the teachers who _____ to lead the group _____ asked to be at the
school gate before 6:30 in the morning.
A.is; is B.are; are C.are; is D.is; are
You will never gain success________ you are fully devoted to your work.
A.when B.because C.after D.unless
Among the many dangers__________ sailors have to face, probably the greatest of all is fog.
A.which B.what
C.where D.when
The climate here is quite pleasant, the temperature rarely, ________, reaching 30℃ in summer.
A.if not B.if ever C.if any D.if so
