题目内容
根据句意,写出括号内所给单词的适当形式。
1.Tourists can watch the ______________(升起)of the national flag at Tian'anmen Square.
2.My mother is always _________________(鼓励) my father in his choice of career.
3.What caused the accident remains _____________(未知的). We need to do more research on it.
4.The _______________(建议) they have offered are very useful. We should take them.
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