b) became

c) received

d) owned

e) made

f) had

g) did the alcohol turn to acid

h) when did this happen

i) couldn't

j) threw

k) asked

l) didn't know

m) examined

n) found

o) believed

p) caused

q) Did milk, wine and vinegar behave in the same way?

r) disagreed

s) made

t) continued

u) invented

v) proved

w) worked

x) developed