Ответ:

1. The national park was opened by the government.
2. The hill was covered with forest.
3. The panda's bowl was filled with bamboo shoots.
4. A fish's body is covered with scales.
5. Cleland Wildlife Park is surrounded with tall trees.
6. The top of the mountain was covered with snow
7. Last weekend, the turtle nests on the beach were counted by science students.
8. The trees were cut down with a saw.

Объяснение:
Мы используем by чтобы указать кто совершил действие.

А with чтобы указать с помощью чего его совершили.

Ответ:

2 the

3 up

4 the

6 the

7 on

Объяснение:

.