1.My friend and I got ... to study endangered animals.
a) on. b) together. c) behing.

2.As soon as my friend and I met , we knew we were going to get .... well, and started writing an essay about endangered animals
a) on b) together c)behing
3.We started the essay about endangered animals and got .... till 5 pm.
a) on b) together c) on (continue)