The generous man devoted all he had _______ the victims, because of which he was highly praised.
----Can I take your______,Sir? ----Please wait for a moment.
---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_______.