Be sure _______ when you enter the cave. Otherwise, you’ll hit your head on the rocks.

That’s not picture. is on the desk.

Nancy, how long does it take you to fly to Canada? –Sorry, I don’t know. But I can telephone my father to _____ it for me.

I usually do some reading ______ 6:00 pm _____ 8:00 pm. [ ]

Never give your ______information to others on the Internet.