--------Have you asked somebody to repair the machine? --------Oh, sorry, I forgot it. I _________for an engineer at once.
---He made up his mind to devote his life________pollution_______happily.
________you can pass the exam or not depends on yourself.
---- It is generally believed that teaching is __________it is a science.
----Three students came late to school this morning, Tom and Jack_______.
----Drinking is harmful_______our health.