----Where is my watch? I can’t find it.----Don’t worry. It must be ______ in your room.
You’d better _______ too much meat. You are much too fat.
You should _______ the doctor’s advice and _______ the medicine on time.
_______ necessary for us _______ our environment clean and tidy.
She was afraid of __________SARS because it was dangerous.
-----Who taught _________Japanese?----I learned it by ______________.