1. A. dear B. heart C. hear D. fear
2. A. stupid B. studio C. study D. student
3. A. brother B. thick C. they D. that
4. A. hobby B. hour C. humor D. hole
5. A. doctor B. hospital C. pollution D. tomorrow
6. A. appear B. solar C. bamboo D. parade
7. A. skytran B. hyperloop C. cycling D. friendly
8. A. comfortable B. convenient C. economical D. autopilot
9. A. mine B. driver C. his D. find
10. A. thunder B. earthquake C. gather D. healthy