初中英语,谢谢ing~~~

题目

初中英语,谢谢ing~~~
根据汉语提示完成句子
Scott thinks snakes are the most __(危险的) animals.
Alan became __(沉默的) after he failed the exam.
Bob's uncle __(买) him a new football last weekend.
Great changes have __(发生) in our city since 2000.
The old woman used to __(谋生) by selling flowers.

答案

dangerous
slient
bought
taken place /happened
make her living