aged to reach the summit of his career, but it was at the ______ of his health.

I think he is a student, ____

That evening he ____ ____what he hadthought about the research.

In the Gulf of Mexico the animals’ presence close to shore means their usual habitat is badly polluted, and the crowding could ________ mass die-offs as fish run out of oxygen.

I’m sorry. I ___________ at you yesterday.— Forget it. I was also a bit out of control myself then.