It is worth considering what makes “convenience” foods so popular,and ________ better ones of your own.
He ______ at once when I promised to help him.
After going into the concert hall, the mother _____ a friend and went over to greet him.
According to the school rules, no student __________ go out of the school after eleven o’clock at night without the teacher’s permission.
Going on a trip into space must be quiteexciting experience.
Food supplies in the flood-stricken area _______. We must act immediately before there’s none left.