Most young girls were scared________stay outside after 10：00 pm.because they were scared________being robbed in the city[ ]

Let’s go to see the animals inYunnan Wild-life Zoo today, Nancy.

It is illegal for a public official to ask people for gifts or money _________ favors to them.

Must I turn off the gas after cooking—Of courseYou can never be ________careful with that

The project will help people understand the many threats to the natural environment ________ endangered plants and animals live