2个简单的英语问题

1.at(at the party固定搭配）
2.for（为了某人）
to （给某人）
from（从某人那里）

at
From

Did you enjoy yourself __at/during__Li Lei's birthday party?

__From/With__whom did you buy the book?

at在李雷的生日派队上

for buy sth. for sb给某人买...这本是你是买给谁的?

on

1.at 2.For