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一、用所给单词的正确形式填空1.Our headmaster gave a ________(convince) speech to persuade students to donate some money for the disaster area. 2.It is said that human beings came into (exist) about millions of years ago. 3.The world we live in is full of_____________(explain)mysteries. 4.The economy of that area is developing at an _________(amaze) speed 5.The ____________(disappear) of the boy made the whole family unhappy. 6.The problem seemed very ________(puzzle). Few students could work it out. 7.He is the only ________ of his family who ________ the train crash.(survive) 8.Our friendship has steadily ________ (strength)over the years. 9.It was ________ that there wasn't enough ________ to prove his guilty.(evident) 10.As she said: “Do you have to be a member of that____________(organize)? 二、根据提示写出所缺单词的完全形式.As an old teacher he has __________(见证) the great changes that have taken place in the school in the past thirty years changes. 2.It's ____________(适当)to send an email farewell letter. 3. But just for the sake of argument let’s (假设) that it's true. 4.Hospital staff burst into cheers after doctors completed a 20hour operation to have ________(分离) oneyearold twins at the head. | 
