单选题 Certain courses are ______, while others are optional.

单选题 Tax ______ has been very effective in encouraging people to save and invest more of their income.

单选题 After eating the plants for seven days, we became very ______ and could not see things clearly.

单选题 You need to ______ the past and forgive those who have hurt you.

单选题 I’m trying to ______ an interest in classical music in my children.

单选题 We hope this book will ______ a bridge between doctor and patient.

单选题 He ______ into his music and gained fame in a few years.

单选题 They have huge arguments because they’re both so ______.