They spend too much time ________ their homework.
There are ________ books on the desk and the ________ book is an English book.
Can you show me ________ pen? This one is too expensive.
---I hope you ________ to my birthday party next Sunday. ---OK, I ________.
--- ________ try some Shandong food for dinner today? ---Good idea.
---Xiao Wang, ________ will it take to fly to Beijing? ---About three hours.