He was _______ to find that it was almost impossible to undertake the task.
Eating too much fat can _____ heart disease and cause high blood pressure.
_____ we can’t get seems better than _____ we have.
Twelve Cubans left the embassy after_____ there for several days.
To everyone’s surprise, a lawyer was _____ headmaster of this new school.
_____ in the detective story, he didn’t notice his father speaking to him.