John found it a challenge to meet the needs of the boss , he had no way to satisfy him.[ ]

Who’s the most modest boy in your class—Daniel. He never __________ in public.

Why haven’t you asked her to come here— She _______ an important experiment whenI found her and she _______ it.

Is it true that Mike refused an offer from Yale University yesterday—Yeah, but I have no idea __________; that’s one of his favorite universities.

These increased harvests _____ that 22% of the world’s people are fed from just 7% of the farmland in China.