This interesting book only __________ me ten yuan and I __________ ten months reading it.A. cost; spend B. cost; spent C. spends; cost
---- __________________? -----For two hours.
_________ does Jim surf the Internet? Once a week.
_______he is busy, ________he helps us often.
Your child is only five. Is _____necessary for you to be so strict with him?
My mother always has__________ housework to do on weekends.