vistors in the orchard can eat as___fruit as they want

vistors in the orchard can eat as___fruit as they want
a.much b.many c.more d.most
2.thay had forgottem___names
a.one another b.one another's c.on anothers' d.one's another
3/he___go to work on foot
a.always b.never c.used to d.is used to
4l must remember____some salt when l go home
ato buy b.buying c.buy d.will buy
5.___it's raining hard,he has to stay at home
a.because b.for c.as d.none