You ought to have put the milk in the refrigerator．Now ________ sour．
it smell
it is smelt
it smells
it is smelling
The goods ________ when we arrived at the airport．
were just unloading
were just been unloading
had just unloaded
were just being unloaded
A great number of colleges and universities ________ since 1949．
has been establish
have been established
have established
had been established
She will stop showing off if no notice ________ of her．
is taken
takes
will be taken
has taken
I promise that the matter will ________．
be taken care
be taken care of
take care
take care of
There are 100 teachers in our school, half of ________ are female．
which
whom
them
that
We should take action at once ________ it will be too late．
and
or
so
but
________ it to me and I will see what I can do．
When left
Leaving
If you leave
Leave
She had a very ________ manner．
relaxing
relaxed
relax
being relaxed
I will spend the weekend just ________．
to relax