－Did you talk back to your mother when you were a child－Yes. But now I realize I was wrong. I really regret _____ that silly thing to my mum.

What kind of noodles would you like — __________.

-How can you know so much about what’s going on in that country? -I’ve got a friend living there who always keeps me [ ]

The boy’s dream was to have his own laboratory ________ to try out some of his own ideas.

I like swimming, while what my brother enjoys ________.[ ]