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.
Answer: Oc is the answer.
Explanation: I took the test.
Answer:
The real existence of Scotland's Loch Ness monster has been neither proved nor disproved, but an inquiry into the history of the legend,past expeditions to Loch Ness, and discoveries made by the explorers to the area continue to arouse interest in the validity of the monsters existence.