用所给动词的适当形式填空。
1. He is afraid of____ (go) out by himself.
2. We are____ (take) notes while the teacher is having a lesson.
3. He (enjoy) helping others in trouble.
4. Doing much listening practice can make you be a good language____ (learn).
5. It's not easy to understand his____ (speak) English.
1. going 2. taking 3. enjoys 4. learner 5. spoken