Paul is a bad roommate. While I clean the apartment on the weekends, he just....... videogames.

I will not go to bed until I ....................... all of my homework assignments.

The students ...... a new way to process water for six months now.

Bob and Tom enjoyed .................. so much on the school trip.

Which is the BEST WAY to combine the two sentences? There was a presentation at our university today. It was very good.

I finally feel I know English well now that I've studied it ...... five years.