1. find a mistake in each sentences and correct it.
1. before most people book thickets long in advance, they cannot return home for tet.
2. while spring comes, many vietnamese people prepare for a new festival season.
3. we do not have many carnivals in VN, while we have many traditional festivals
4. he was a talented and kind emperor, so he had to suffered poor health.
5. her voice is beautiful, when her performance is not skillful