—Excuse me,may I use your dictionary? I ________ mine behind.
—Sure. Here you are.
leave
have left
will leave
was leaving
----Where is your sister? -----She _________ my mom with cooking.
Which of the following doesn’t belong to the Four Great inventions of Ancient China?
Our planet is about years old.
can cause high blood pressure and hearing problems.
is one of the greatest scientists, who won the Nobel Prize for physics.