Please help me with multi-choice questions!!

I am suffering some questions below because means of them are same, help me please! Thanks

1. He________his father's signature on the report card but was found out by his teacher.

a.counterfeited b.imaitated c.impersonated d.forged

2.Your_________in following those outdated plans will only incur further losses for the company.

a.obstinacy b.determination c.decisiveness d.absoluteness

3.The water is very dirty; look at the_________in the bottom of the glass.

a. dregs b.remains c.leftovers d.sediment

4.A less___ person would not have bothered to correct the error.

a.Scrupulous b.meticulous b.fussy d.detailed

I think the word in choice a is the same as one b, dont I?

5. A boat trip down the Chao Phraya River is included in the______of the tour.

a.Schedule b.Itinerary b.Plan d.record