Answer:
here's the answer to your question hope it helps you
Explanation:
1.the equipment has been broken.
2. heat up the liquid first.
3.safty glasses has to be worn in the laboratory.
4.this year's science competition has been won by a student.
5.dr. liu is said to be a brilliant scientist.
a.4.
b.1.
c.5.
d.2.
e.3.
