— Mr. Wang, I got zero on Answering Sheet One. Could you help me correct it?— I’m sorry, but it ______ be marked by the machine. Mark your test number with a pencil 2B next time.
Leave your key with your neighbor _you lock yourself out one day.
You should report any incident, ______ minor it is.
Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself.
I ______ to go on a diet, but the dishes at the party were simply impossible to resist.
Not until the teacher explained the importance of getting up early ______ we promise to come early.