Question

We made another too useful experiment (a) ______ ______

to show the difference among pure and (b) ______ ______

impure air. We fill some flasks with broth and (c) ______ ______

then exposed some of them to a stuffy (d) ______ ______

air on a room and sealed them (e) ______ ______

up again. We expose others to the fresh (f) ______ ______

air in the fields but sealed them too. (g) ______ ______

Finally, we opened the seals and noted down a difference. (h) ______ ______​

Answer 1

Answer:

a:pure,impure

b:impure air

c:air

d:air

e:again

f:air in field

g: opened

h: between pure air and impure air