1. teach
2. will be built
3. has eaten
4. is heard
1-c, 2-a, 3-d, 4-e, 5-b. Последние два могут быть наоборот, и так и так правильно.
1. we were given a new grammar rule by our teachers.
2. different games are played by children
3. the dictations aren't written by us every day