有2道英语题目想请教老师.
Linda gives a present ____ her mother ____ her birthday.A.to,on B.for,to C.to,to 我觉得用B或者C都不太合适,我想选择A,可是在某人的生日上应该用at 比较确切,
第二题：Paul and Peter's new bicycle is under the tree.（要求一句改为两句）问题是：自行车只有一辆,如果写成：Paul 's new bicycle is under the tree.Peter's new bicycle is under the tree.变成了两辆自行车了.请老师指教.
请老师一定说明理由,