. ______ the ancient Egyptians built the pyramids puzzled people for centuries.
----____ I take the book out?---- I’m afraid not.
You can certainly leave the classroom as soon as your homework__________.
Please don’t phone him between 1 and 3 p.m. tomorrow. He ______ a lecture then.
Five players ________a basketball team.
—Each boy and each girl talking about optional courses(选修课).—Yes! And they each their favorite one!