______ wine, first you must press the grapes.
It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.
Take care! _______ to frequent smog does great harm to your health.
Anyone _______ be in a rough life time, whether he is “Bai Fumei” or “Gao Fushuai.”
It is Tom as well as his two friends that _______ for the job.
You may depend on it_______ I shall always help you.