Question

I have a few more doubts about a few sentences. Thank you.

1) He denied robbing (instead of stealing?) the money.
2) I couldn't do anything but copying the Maths test (instead of "cheating during/in the Maths test).
3) On walking in front of her room (instead of "On passing by her room"), I saw her studying (is "study" possible?)
4) He admitted /confessed TO stealing (is "to" necessary? Is it a mistake if you omit it?)
5) I finished the homework/my homework/homework (Which are correct?)

Answer 1

1) He denied stealing the money.
(He would rob the person or rob the house, but steal the goods.)

2) I couldn't do anything but copying the Maths test (instead of "cheating during/in the Maths test).
("copying" is OK, but "cheating" is better, more precise.)

3) On walking in front of her room (instead of "On passing by her room"), I saw her studying (is "study" possible?)
("walking by her room" or "passing by her room" -- both work; "studying" is best.)

4) He admitted /confessed TO stealing (is "to" necessary? Is it a mistake if you omit it?)
(The sentence reads best if you keep "to" in the sentence.)

5) I finished the homework/my homework/homework (Which are correct?)
("my homework" or "the homework" are best.)