He did nothing but ________walk in the street.
---I’ll ask the teacher about past tense. I’m very puzzled about it. --- That is just _____ most of our classmates have doubt.
Don’t you think this sweater is too tight ____ the shoulder?
But for your timely help, I ________ the project as scheduled.
That student admitted ____ in the math exam, _____ that he would never do that again in the future.
If ____ unsolved, the problem of food safety may lead to more serious results.