Read the discussion in The RAP chatroom (Student’s Book, Part 1, page 12) again and find phrases with a similar meaning. In some cases there can be more than one phrase

to be interested in sth — to be keen on sth – to be into sth
to be serious about sth —take sth seriously
to be obligatory — be a must
to set one’s goals high —aim for the sky
to use time in a way that has no useful results —waste time
to live from hand to mouth —to live from paycheck to paycheck