Question

12. When the students
.the experiment, they
an explosion
a) were performing, were hearing
b) performed, heard
c) were performing, heard
....a phone call from my mother a few hours ago
13. 1....
a) was receiving
b) received​

Answer 1

Answer:

option a is the correct answer please mark me as brainlist

Answer 2

Answer:

12. Were performing and heard

13. Received

Hope it helps you!