Use the paragraph below to answer question $10.$

$(1)$ Nurse Sanchez pushed Mr$.$ Ebert's wheelchair into the office. $(2)$ Dr Lin greeted him with a warm smile. $(3)$ She wrote the date, Feb. $28,2006,$ on his chart. $(4)$ His next appointment would be on Thurs., March $10.$

$10.$ Which sentence above has an incorrect abbreviation?

$($A$)$ Sentence $1$

$($B$)$ Sentence $2$

$($C$)$ Sentence $3$

$($D$)$ Sentence $4$

$11.$ What change would make the sentence below correct?

You sings better than anyone I know.

$($A$)$ Change you to you've.

$($B$)$ Change sings to sing$.$

$($C$)$ Change than to of$.$

$($D$)$ Change know to knew.