bai1: ; /g/:go,gone,give,clothes,gift,hug ; /k/:kick,chemistry,school,classrom,kitchen,architect
bai 2: 1.publish transport 2. rubbish ; 3.traffic jams ; 4.community service ;5.graffiti ;6.advertisements ;7.volunteer
bài 3: ride-rode-ridden , grow-grew-grown ,write-wrote-wriden ,bé-was/were ,drive-drove-driven ,speak-spoke-spoken ,do-did-done ,have-had-had ,see-saw-seen ,take-took-taken
bai 4: 1.ever ;2.just ;3.just ;4.yet ;5.just ;6.yet ;7.already

bài1.
a,go gift give hug.
b,kick chemistry school clothed classroom kitchen
bài2.

1. ​​community service
2. rubbish
3. traffic jams
4. advertisements
5. graffiti
6. public transports
7. volunteers