Which of the following sentences is written correct a. she filled her living room with dozens of tulips b. he needed hundreds of quilt squares for his project c. 7 thousands of people showed up for the concert d. does anyone know why steve order 5 dozens of eggs

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

may i know the title of the book?