查英语题（关于初三的）（写出解释）

查英语题（关于初三的）（写出解释）
第一道：I was _______（water）the flowers when you called me at 9 a.m..
第二道：I'm sorry that I can't ________ the school sports meeting.
A. take hold of B. join in C. agree with
I have been working in an American company since I graduated ______ cliiege.
A. for B. with C. from
We must _______ a tent at the foot of the mountain before the sun goes down.
A. set off B. set up C. set in
改一下：cliiege 打错了改为college