1．We owe (应给予，感激) a lot to our teachers.
2．This meat is so tough I can hardly chew (咀嚼) it!
3．For dessert (甜食), you can have ice cream or apple pie.
4．Children should learn above all how to observe good manners (礼仪) at table.
5．The fillings (馅) can be either meat or vegetables.
6．A lot of poisonous (poison) waste from the chemical works polluted the river.
7．His cakes were so tasty (taste) that he sold them in dozens.
8．We climbed up energetically and breathed the fresh air greedily (greed)．
9．Xiao Wang is doing his best to meet the_requirements (require) of his parents.
10．The students begin their classes at a fixed (fix) time.
