The selection of English teachers used to be mainly based on ________.
Woolgrowers and dingoes have usually defined the Fence only in____
for it 3 many organ- isms to survive under different conditions.
我们无法想象在那个遥远的星球上存在什么东西。
they are found only in places where they can live 10 with the least effort.
父母没有预料到孩子的问题这样难回答。