Past perfect continuous

My family had been (a)   a picnic when it started to rain.

Marcus had been (a)   for his cap since yesterday.

My students had (a)   practicing a lot for this test.

You had been (a)   the party but the electricity went out.

They (a)   been studying at school today.

Your friends had _______ _____________ hard on the project.

(a)  

Jessy __________ ____________ ____________ for hours.

(a)  

People ________ ___________ _________ because of the sad movie.

(a)  

Family members _______ ________ ________ groceries at the supermarket.

(a)  

Soccer players ________ ________ ________ their best but they fail the game.

(a)