I decided to buy a birthday cake ( )my mother on her birthday.括号中应填to还是for?其中有什么语法

I decided to buy a car等于I decided ___ ___ a car I have decided to buy a new car 等于 I have ( ) ( )( ) ( ) to buy a new car I I decided to buy a new bike ,for the old oI I decided to buy a new bike ,for the old one was ______ repair.A beneath B below C beyond D about蟹蟹 I decided to buy a now computer(改同意句） I have already decided to buy that new phone对吗 请问一下哪里错了 It will soon be her birthday .I have decided to buy a present to her. I want ( )a pen ( )$4.A buy for B to buy for C buy from D to buy from i have a coat ,i want to buy a b He decided to buy a new car.同义句He decided () () a new car. He decided to buy a new house.(改为同义句） He decided ( ) ( ) a new house. He decided to buy a new house(同义) He decided-------- -----------a new house. Tom decided to buy a digital camera _____the Internet A.at B.in C.on D.by I _____terrible.I decided _____a doctor. A.feel;to see B. felt; to see The coat was expensive,__he decided not to buy it.A.so that B.because C.though D.if A to buy it B to be bought C I must buy D must I buy 那个正确 I can't decide __.A.to buy which one B,which one should I buy C.which to buy i just don't know()myself A.what to buy for B.to buy what for C.what to buy to D.to buy what to I want_some fruit.A.buy B.to buy C.to buying