Hotels fill up fast during the busy tourist season, __________it is necessary for tourists to make reservations in advance.
— Is your mother going to the supermarket? — No,______.
______,I will help you with your work.
You’d better put things back _______. Otherwise, it will be difficult to find things.
As you ______ new words in context, it is a very good method for you to guess their meanings.
The good-for-nothing graduate’s mind _______ when he learned that he could not get the graduation diploma because of his poor performance.