—I’m sorry, Mr Li. I ________ my exercise book at home.—Oh, don’t forget ________ it here tomorrow, please.
Look! We can’t cross the bridge. It by some workers.
—Are there any story-books for students In read in the library? —There are only a few, if _.
You are_____ young to understand it.
Bob asked me_.
—_did he come? —He came to ask for help.