If we _____ take environmental problems seriously,the earth _______ worse and worse.( )
A.don't; won't beB.won't; isn't
C.won't; isD.don't; will be
Could you speak in a loud voice so that I can hear you _______________?( )
A.quicklyB.happilyC.slowlyD.clearly
Amon ____________ his ship in a big storm when a giant fish came out of the sea.( )
A.will sailB.is sailing
C.was sailingD.has sailed
Would you please ____________ the light? I can't sleep well with it on.( )
A.turn onB.turn off
C.turn toD.turn around
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