He promised _____his old friend during his stay in Tianjin.
A．see B．seeing
C．saw D．to see
—What a heavy rain!
—So it is. I prefer ____ rather than ___on such a rainy day.
A．to go out; stay at home B．to stay at home; go out
C．going out; stay at home D．staying at home ; go out
How kind you are! You always do what you can ______ others.
A．help B．helping
C．helps D．to help
—Would you mind_____the window? It's very hot.
—No, not at all.
A．open B．to open
C．opening D．to opening
You look too tired. Why not______a rest?
A．stop to have B．to stop having
C．stop having D．to stop having
At times, parents find it difficult ________ with their teenage children
A．talk B．talked
C．talking D．to talk
考点：非谓语动词
