If you are famous, people will watch you _____ and follow you everywhere. [ ]

Mike, can you tell us something about our new teacher?– Oh, sorry. I know nothing because I _____________ him before.

Mary _____ up yet because she _____ to bed very late last night.

What is your father doing now? -He ________ the room.

The price of the bike depends _______ its quality(质量) .[ ]