There are over 58,000 rocky objects in ______ space,about 900 of which could fall down onto ______ earth.

led you yesterday A woman answered,but I didn’t recognize her voice” “Oh, it _____ my aunt Jean”

With Mike _____ as our group leader, we had no trouble finishing the task ahead of time.

“When are you Wuhan?” my friend asked me

Eco-tourists want to learn about the world _______ they can make it better, or at least understand it better.[ ]