Answer:
Before the main performance, a comedian entertained the audience.
Explanation:
A.I'm not satisfied with your explanation of where you <u>were</u> last night.
b.I came into the room when Mary <u>was playing</u> the piano.
c.no error!!!
d.There <u>are</u> some sheep in the field.
e.Playing the drums and singing<u> is </u>difficult.
Kimmy thought she had one-fourth of the money that the other student did, but she was wrong.
The .gov one because .gov means “government” and it is a site with facts and already done research. A blog is just an opinion