—Do you know Mount Wudang in Shiyan?
—Yes,I _________ it twice.It's fantastic.( )
A.had climbedB.climb
C.climbedD.have climbed
I saw Sam and David in the playground yesterday afternoon.They____games with their classmates then.( )
play
will play
are playing
were playing
For our own safety,it's important to ______the traffic rules on the way to school.( )
follow
change
make
break
Don't hurry him.You will just have to be____and wait until he finishes the work.( )
active
careful
patient
famous
﹣﹣﹣Look at the stone bridge!Do you know____it was built?
﹣﹣﹣In the 1860s.It is quite old.( )
when
how
where
why
Please don't make so much noise.I_____hear the speaker very well.( )
needn't
mustn't
can't
shouldn't