struggle     confuse      reduce        observe 

disturb      be intended for     argue with     refer to

equip…with     build up     focus on     be satisfied with

fall out with, even if, get away with, only if, appeal to, be familiar with

prevent from, root for, in search of ,treat as be familiar to

lose track of    be determined to do

concentrate on    be best known for

stay in touch with    be in trouble

have an effect on    lead to

up to   cut down

recover from    manage to do

to one's shock    work out