1. Students’ own answers
2. 1 off
2 down
3 out
4 off
5 up
6 off
7 out
8 on
9 off
10 on
11 back
3. 1 made
2 sorted
3 brightens
4 died
5 came
6 phased
7 clear
8 brush
9 sign
10 log
4. depart: make off, clear off
end: sign off, log off
disappear: phase out, die out
solve: sort out
approach: come up
improve: brighten up, brush up