Seeing the happy ______ of students playing basketball there, I cant help thinking of my school years.

It was half a year ______ my good friend returned to his hometown.[ ]

Since the project has been ___ on well, you must ___ it on until it is completed

You really need to go out and get some fresh air and sunshine. You _____ overworked during thelast two weeks . [ ]

I should very much like to have gone to the party but I _________