These students will graduate from college next summer, by which time theyin college for four years

What’s the matter _____your younger sister — She has a cough.

Would you like to come to my house for dinnertonight—– I’d love to , _____ I have lots of work to do .

Jenny will visit me if he____________ here.

One of the tourists ______ from the tour group. That was why the tour guide lost his temper.