The girl had to ____the college entrance exam because of her maother’illness.

If you ______ with your classmates, you will surely get the same work done far better.

– When did you ________ to do the work?- Two months ago, we are through 80% of it at the moment.

Who ________ a theory about black holes?

We are interested in the weather because it ______ us so directly---- what we do and even how we feel.