I turned to the headmaster and he promised to do everything _ his power to helpme out

My son prefers us to email each other once a week spend half an hour on the phone every night

me was so exciting to play that the boy kept hiseyes and attention ________ on it, ruining both a lot

I would have come earlier, but I _____ that you were waiting for me

Many students are ________ chatting online, which wastes them plenty of time.