Thingsare________onMars________onEarthbecauseofthedifferentgravity.

“How many students have visited The Summer Palace” “.”

I get up ______ six ______ the morning every day, but______ Sunday morning I get up a little later.

In the reading room, we found her_______at the desk,with her attention______on a book.

How long have they ________________ each other— ________________.