20. A.
on¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B.
off¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C.
by¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D.
in
17. A.
avoid¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B.
refuse¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C.
praise¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D.
love
20. A.
on¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B.
off¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C.
by¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D.
in
17. A.
avoid¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B.
refuse¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C.
praise¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D.
love