We can’t go swimming ________ our parents are with us.
if
when
unless
—I was told to cook for my mother on her birthday.—What ______ great advice! Who gave you ______ advice?
—Can you tell me _________________?—Since 1990.
—Will you go back home to see your parents or your parents come here to spend the holiday with you in the Spring Festival?—__________.
This is the place ______ I met him 10 years ago.
—My dad bought me a new MP4, but I don’t know __________.—Let’s read the instruction.