--The man in a black suit _______ be our youth worker. -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.
-----When _____Jack ______for Shanghai? -----Tomorrow morning.
What’s the weather like in Beijing in winter? There is______snow and it is _______cold.
After finishing_______his homework, Tom decided______a walk in the park.
__________too much TV isn’t good______our eyes.
Li Lei can’t go hiking with us today,because he take care of his sick mother.