The job was demanding. It is not _____ to ask the employee to get it done in less than two hours.

Polio is a powerful disease that could ______ a person; that’s why many polio patients spend most of their lives on wheelchairs.

To _____ the younger generation, Miss Li opened a Facebook account.

Volunteers distributed mosquito nets to some African people to help protect them from _____ malaria.

Overdevelopment and overpopulation could not only lead to climate change but also ______ precious wildlife.

Nothing is more ______ to a relationship than nagging all the time. Some even consider nagging to be a marriage killer.

It is hard for the people involved to ______ the situation objectively. Namely, outsiders can produce more objective observations.

Flo’s face turned ______ as her boyfriend declared that their relationship was over.

After falling ill, Jerry realized that health should _____ and did everything he could to recover from the illness.

The newspaper office is entitled to conducting a(n) _____ interview with the scientist.

The duration of the heart ______ lasted about three hours, but the medical staff did not even complain.

In an all-you-can-eat restaurant, one can enjoy unlimited amount of food without ______.

Emission of carbon dioxide is _____ to our planet, and the Earth may no longer be sustainable (永續的) in the future.

It ______ everyone in the office that our manager is going to leave his wife for a young, handsome guy.

It is said that Thomas Edison ______ numerous failures and disappointments before he invented light bulbs.

People’s behavior is the result of the _____ influences to which they have been exposed.

Now that most of the guests have arrived, let’s get the party ______.

Nicholas took his grandmother to the hospital to have her eyes ______.

It was in 1789 _____ the French Revolution took place.