1．on________(平均) we received 3 letters each day.
2．i've________(致力于) all my time to being a waiter right now.
3．do you know how much he________(挣得) a month?
4．she knew from past________(经验) that ann would not give up easily.
5．the teacher's words________(鼓励) me to work harder.
6．these are________(具有挑战性的) problems.
7．the government has promised an________(额外的) ￡1 billion for health care.
8．please give my________(问候) to your family.
9．he________(交换) an apple for an orange.
10．she looked back on her career with great________(满意)．
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