-----This returned Chinese scholar has become one of the top experts in this field.-----Yes, I know him very well. He _____ in Africa with wild animals for eight years.
The windows haven’t cleaned for a long time.They need ______.
–That would mean ____ a lot of time. --Really? I don’t mean ____ any time.
____ the TV play, he got down to ____ his homework.
—Will you go skiing with me this winter vacation? --- It __________________.
I lost my way. I wonder ________ I can turn in the dark.