It puzzles the scientists _____ some mammals produce their young _____ others lay eggs

Well done ! The customers were_____ by your wonderful body language. [ ]

We’re all ready to put it into operation______, we’re going to take action as fast as possible.[ ]

I’ll be away on holiday. Would you mind lookingafter my parrot—- Not at all. _______________.

The teacher wants the children to feel ________about asking questions when they don’t understand.[ ]