______ it's a public holiday today,some firefighters in our city are still on duty.( )
A.AlthoughB.OnceC.If
Love your parents __________ they are alive. Don't wait until it is too late.( )
A.whileB.thoughC.becauseD.unless
The flying squirrel might be one of __________ animals you could meet during the trip.( )
A.strangeB.stranger
C.strangestD.the strangest
Some people don't show their talents at the very beginning.
I agree. Even Einstein ____________ read until he was seven.( )
A.can'tB.mustn'tC.couldn'tD.needn't
Keep quiet! I need complete__________ when I'm working.
Sorry, dad. I won't make any noise again.( )
A.trustB.silenceC.controlD.strength
Please stay with me this weekend.
I'm sorry, but my father and I planned _________ Beijing a long time ago.( )
A.visitB.visitingC.to visitD.visited