—Let me help you carry the box.—No, thanks. It’s big, __________ there is nothing in it.
The_______ of most trees will fall in autumn. A leaf B. leafs C leaves
You ______ wear sports shoes when you climb a mountain.
Thomas wants to know ______Nina lives.
He didn’t go there yesterday, _______he?
He ______when the UFO arrived. He didn’t wake until the UFO disappeared.