A Hard Situation

Several days ago my teacher offered me a job to teach a high school student English, at first I was quite excited and accepted this job without hesitation, cos I thought I could earn some living cost by it. But soon I found I made a mistake for later my teacher told me I probably would be required to live at that student’s home and accompany with him as long as I can. This is impossible!! I hate sleeping in a stranger’s house and I hate wasting too much time earning money since I am still a student!! But now the problem is that my professor asked me to do that!! If I refuse him, I don’t want to see a low score in my final school report card, besides, he offered me this job with open arms, how could I let him down??

The current situation is that I’ve arranged an ample schedule of this semester, although the task of my major is not very heavy, I need to prepare my IELTS for next semester which is quite tough to me, because I still cannot achieve the appropriate level that I want, my vocabulary and my grammar stay faulty none the less.
(mass IELTS books)

Meanwhile, I’ve studied Spanish with my American friend Will since last semester, he is so kind!! he’d like to buy me the teaching book and teach me, and he always says “we can improve our Spanish together” even if his Spanish level is much higher than mine indeed.(btw, believe or not, his Chinese is almost perfect as a native) This afternoon I went to his house as usual and continued our course, when I told him my situation, he remains encouraging me to find out other time studying with him, so see?! He is a really great friend!!^_^ Will, gracias(spanish)! (my amazing español book)

Now I just pray my teacher will not reach a consensus with that family, then I needn’t to go, except that I really cannot figure a proper excuse to refuse it. Any idea will be appreciated!!!