This was the knife _________he cut down the tree. Tom is the person _________ I often turn for help when I am in trouble. Tomorrow is Tom’s birthday. He is the person _______ I will buy a gift. We’ll visit the beautiful village _________ Mary comes. The house__________we live is not large.

to whom

for whom

with which

in which

from which

使用某种工具用介词with

turn to sb for help

buy sth for sb

come from

live in the house