Has Jack solved the difficult math problem?
Not yet. But I believe he_____in a few minutes.( )
A.has worked it outB.will work it out
C.was working it outD.works it out
Vivian will take her daughter to the amusement park_____she gets the tickets.( )
if
until
although
unless
Which club do you prefer to join,the chess club_____the dancing club?( )
so
but
or
for
﹣Tom,_____here to carry the luggage upstairs for me,will you? ﹣All right.( )
come
came
coming
to come
According to the traffic law,children under 12_____ride bicycles on the road.( )
won't
wouldn't
needn't
mustn't
Doctors tell us_____our hands before and after every meal.( )
wash
washed
washing
to wash