It is very kind _____ you to help me with my work because it is very difficult _____me to do it by myself.

A．of； for          B．of； of           C．for；of           D．for； for

It is very kind _____ you to help me with my lessons because it is very difficult _____me to learn them well.

A. of； for        B. of； of         C. for；of       D. for； for

完形填空。（10分）
Bruce is only an 8 years old boy.He loves the 33    very much.Many students in his class have pets(宠物), 34    he doesn’t have one.So he wants his mother to buy him a 35    .It’s Sunday today.Bruce and his mother go shopping.Bruce asks,”Mom,could you buy me a pet?”
“Let me see…What pet do you 36  ?”his mother asks.
“I want a  37   .I like it very much.”
“Oh,dear.You can’t have a pet monkey.It will  38  your bananas.”
“How about a panda?It’s cute.It’s my 39   animal.”
“A panda?No.It will drink your milk.”
“Well,”Bruce 40   a moment(一会儿).”Oh,I can have a pet elephant.It can’t drink my milk.It is very kind,too.”
“It’s so 41  and we don’t have a big room for it,”says his mother.”You can have a pet.It isn’t big,and it can’t drink your milk or eat your bananas.”
“Well,I know.”
“ 42   is it,my dear?”
“Dad!Bruce says happily.

A smile will tell people around you that you are a kind and friendly person. However,many people don’t smile because they think they ugly teeth. For example, one of my classmates, Mile, doesn’t have very nice teeth,so thatis why he seldom opens his mouth.he even says that he has lost cofidence because of his teeth.So it is very important for us to look after our teeth. In fact, a lot of people have this problem.Some people inherit teeth problems from their parents,while others’teeth are damaged because of bad habits,like heavy smoking,eating too much sugar or not brush-ing teeth often.If your teeth are in bad shape, you should see a dentist and ask for help. They can help improve your teeth and tell you how to take care of then.
Smiling can help you to feel more confident and make other people think of you as a more friendly person. If you want to keep healthy,you should not only smile but also laugh. An Indian doctor called Kataria said that young children should laugh about 300 times a day, wile adults should laugh between 7 and 15 times a day. So please take this chance to smile and laugh now!
根据短文内容，选出一个最佳答案填入题前括号内。
【小题1】What has made Mike lose his confidence?
His bad habit.  B. His bad teeth.  C. Not smiling.  D. Eating too much sugar.
【小题2】 Many people don’t smile because    .