If you keep on, you will succeed ________.
A．in time B．at one time C．at the same time D．on time
Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
A．it; it B．what; what C．what; it D．it; what
—Thank you very much.
—It’s a piece of cake compared to your saving my life: I am forever ______.
A．in your debt B．in debt C．getting into debt D．remembering you
—Why are you so disappointed?
—I went there hurriedly and waited there for 3 hours, ______ the tickets have been sold out.
A．being told B．only to tell C．telling D．only to be told
—What are you doing outside the class? Didn’t you hear the clock ______?
—Sorry, sir. I ______.
A．strike; didn’t notice B．striking; wasn’t noticing
C．is striking; didn’t notice D．struck; wasn’t notice
We have made it a rule that whoever finds that tree first can take_________ of it.
A．possession B．seize C．hold D．seat
