please check these for me:

1. He had (burst, bursted) his balloon at the carnival.
burst

2. The (whistle's, whistles') shrill sound hurt my ears.
whistle's

3. The witness (sweared, swore, sworn) an oath on the Bible.
swore

4. Our yard is covered with leaves because they (fall, fell, fallen) swiftly during yesterday's storm
fell

5. That is the (most softest, softest, soft) sweater that I have ever had.
softest

6. This is the (cheap, cheaper, cheapest) bicycle in the store.
cheapest

7. Every girl will exhibit (her, their) best work
her

8. He (drink, drank, drunk) all the ice tea.
drank

9. John had (bring, brang, brought) all his papers to the officer.
brought

10. The average temperature in Tucson, Arizona is (high, higher, highest) than the average temperature in Boston, Massachusetts.
higher

11. No one ought to behin what (he/she, they) cannot finish.
he/she

12. My brother is (more taller, most tallest, taller, tallest) than anyone else I know.
taller

13. Two (player's, players') gym suits were in the lovker room
players'

14. (Jennifer's and Erick's, Jennifer and Eric's) tickets for the concert could be picked up at the customer service desk at the entrance.
Jennifer's and Erick's

15. Nicole sings (more confident, most confident, more confidently, most confidently) than the others in the concert.
more confidently

thanks

5 answers

14. should be the second one(:

are you sure.?

because in my book it it gives an ex:

Michael and John each have new haircuts that are stylish..

and it turns into:

Michael's and John's new haircuts are stylish

it says:
"If two or more people own something, just MAKE THE LAST PERSON POSSESSIVE.
ex. Jan and Dean's party (both own the same party
ex. the husband and wife's car (both own the same car)

if two or more people are joined by the word "and," and they each own their own items, THEN EACH PERSON IS GIVEN THE POSSESSIVE FORM
ex. the husband's, the wife's, and the son's car (The husband, the wife, and the son all own their own cars)
Jan's and dean's party (both Jan and Dean have a party)

so i'm confused!!

14 is correct as you have it. All are correct.

The reason 14's answer needs to be the first one is that Jennifer and Erick had separate tickets -- one each!!

ok. thank you writeacher :)

You're very welcome.

=)