16:After such a long walk,mylegs-----and I couldn't go any f

16:After such a long walk,mylegs_____and I couldn't go any futher.
a:give out
b:gave off
c:gave in
d:gave ip
17:Afraid of being scolded by the teacher,Tom ______a story to explain why he was late.
a:wrote
b:provided
c:told
d:invented
18:Do you play football after work?Yes,________.Playing football is not my favorite sport.
a:more or less
b:once in a while
c:wime and again
d:sonner or later
19:_____football match between China and Korea was held yesterday,but Ifailed to get_____ticket.
What_____pity!
a:The,/,a
b:A,a,/
c:The,the,a
d:A,the,/
20:With a lot difficult problems______,the newly-selected president will have a hard time.
a:settled
b:settling
c:to settle
d:being settled