They_____the same mistake foru times this month

Which part of the sentence” She has completed a five years integred PG course.” Is incorrect?

_________the Panchayath President nor the members attended the meeting.

This year monsoon has been______in the last two decades.

__________we wore very busy with the rehersal, we didn’t have enough time to meet you.

Oh! She was treating the strange boy______he was her own son.