The new supermarket announced that the first to purchase goods on the opening day_______ get a big prize.

I like playing        basketball and playing        erhu. 

That children ______meet with setbacks is a matter of necessity as they_____, so parents don’t worry about that.

You ______to meeting this afternoon if you have something important to do.

If you know nothing about the famous program called Where are we going, dad?, you ______be living in a box!