________ is difficult if you put your heart into it.
---________. What’s the time now, please?---Let me see. Oh, it’s nine.
--- ________ do you go to see your grandparents?--- Once a week.
--- Are these your bikes?---No, _______ aren’t.
May I take a seat here? ---_________.
---Is there ________ water in the bottle?---Yes, there is _______.