Most parents think it is a good ________ to take a school bus because it’s quite safe.
risk
choice
game
pity
Do you know ________ the Smiths left Shanghai?
I'm not sure about the date.I only remember it was a Sunday.( )
if
why
how
when
Could you tell me ______ you will come back?
In ten minutes.( )
how soon
how often
how long
how fast
Look!Someone _______ the classroom.
Well,it wasn't me.I didn't do it.( )
is cleaning
was cleaning
has cleaned
will clean
Did you pass the test?
Yes.I'm very _____ for your advice.( )
thankful
careful
useful
helpful
You can't smoke here.
Sorry,I ______ the sign.( )
don't see
didn't see
haven't seen
won't see