Question

1) Put into the active voice
a) The group was abondened by the leader
b) The river will be widened by engineers
c) A new stadium has been build by the government
d) The invitation would be accepted by the girld
f) The lesson can be understood by the students
g) Cows and pigs are raised by Jonathan
h) Two letters were received by Janice
j) The Laws of Mendel was being studied by Bob
k) The report had been written by Alice

Answer 1

a - The leader abandoned the group;
b - Engineers will widen the river;
c - The government has built a new stadium;
d - The girl accepted the invitation;
f - Students can understand the lesson;
g - Jonathan raised cows and pigs;
h - Janice received two letters;
j - Bob studied the Laws of Mendel;
k - Alice has written the report.

Acho que é assim :D