1. It is amazing to see so many wild plants and animals in African ____________ (丛林).
2. People have lost ____________ (耐心) with the slow pace of reform.
3. We are so disappointed that he gave us an ____________ (模棱两可的) answer.
4. Is English a ____________ (必修) subject in your school?
5. What ____________ (百分比) of his income is paid in income tax?
