6 11.6.2 Fill in: a/an, the or- .
1 experiment can help a researcher prove
their theory
2 antibodies exist in our blood.
3 The project gives free medical care to poor.
4 lab is where scientists conduct
experiments.
5 knowledge is the foundation on which
science was built.
1) -
2) an
3) the
4) a
5) a
Объяснение: пиши на свой страх и риск