4) 1 - a, 2 - c, 3-b, 4 - d, 5 - a , 6- b, 7 -d
5) seldom - often
excellent - bad
plenty of - little
never - always
useless - useful
to come back - to leave
full - empty
easy - difficult
poor - rich
then - now
war - peace
to close - to open
free - busy
to offer - to refuse