Trả lời: a. _2_ Oh, hi, Mom. I'm just practicing my guitar.b. _5_ Hmm... well, you should study some more before tomorrow.c. _3_ Why aren't you studying? Don't you have a test tomorrow?d. _1_ What's all that noise?e. _4_ I do, I'm just taking a break. I already studied for a couple of hours today.f. _6_ OK...