Fill in the gaps with suitable prepositions or adverbs where necessary.1.

Fill in the gaps with suitable prepositions or adverbs where necessary.
1. His behavior is______my understanding.
2. Fluctuating prices are usually based____ public demand_____certain goods.
3. The students are excited and the same holds true_____ their teachers.
4. We are spending a lot more_____ food than we used to.
5. They derive such great enjoyment _____these simple games.
6. Whether we shall go or not depends ______your final decision.
7.______ total over 250 people attended the conference.