When you are confused about some words in reading, you can ______ the dictionary.
_____ deep down in the earth, the dead forests rotted away and became coal.
Only when class began _______that he had left his book at home.
—I have to get to the post office by six o’clock, but it is almost six now. —This clock is fifteen minutes fast.
Information has been put forward that more middle school graduates will be to universities.
There is not much time left, so I’ll tell you about it.