The biggest challenge we all face is to prevent further environmental disasters. We ________ take action before it is too late.
can
must
may
might
We are going to take the high﹣speed train to Xi'an tomorrow,so an early arrival at the station____________.( )
advises
is advised
is advising
was advised
A stupid man tells a woman to shut up,while a wise man tells her that her mouth is quite beautiful it is closed.( )
unless
since
when
though
The boss asked Tim to go and out if there was anyone else absent.( )
find
finding
to find
found
﹣﹣﹣There is someone knocking at the door.
﹣﹣﹣It must be the computer repairman.I him to come to fix my computer.( )
call
have called
called
will call
﹣﹣﹣You look very pretty,if I say so.
﹣﹣﹣Thanks a lot for saying that.( )
will
have to