When do you have science?—I have science ________Tuesday and Friday.[ ]

Who’s the boy?—- He is Jim and _____ my friend.

I want to go to England _____ March 2nd.[ ]

Would you please_______ the TV a little? Jack is doing his homework.- Terribly sorry. I will.

It is useful to be able to predict the extent _____ a price change willaffect supply and demand.