I didn’t quite follow him because he explained the theory _____that is too abstract for me.
I __________ laughter at the sight of the funny actor.
The scientist, __________ my father works, is about 50.
--- Hi, Torry, can I use your computer for a while this afternoon? --- Sorry, __________.
You needn’t write on __________ line. You can write on __________ line.
You __________ to leave until you __________ your work.