Sally has been swimming _________ four hours．
for about
since
about
/
Sam _________ coins since he was eleven years old, and now he has hundreds of them．
collected
had collected
has been collecting
had been collecting
I had a really hard time _________ studying science this term．
to
with
in
on
Don’t _________ others when they make mistakes．
laugh at
laugh with
laugh to
laugh
Frank _________ to see his grandma if he _________ free tomorrow．
will come; will be
comes; is
will come; is
is; come
Don’t bring food to the party．If you do, the teacher will _________．
take them away
take it away
take away it
take away
There are many trees on _________ sides of the road．
each
every
both
all
They have been skating _________．
for three hours ago
since three hours ago
three hours ago
since three hours
He is interested in _________ English songs．
to collect
collect
collecting
If you want to talk to your teacher , you should _________ first．
called to her
called up her
call her up
called her up