We cannot figure out ________ quite a number of insects, birds, and animals are dying out.

Pop music is such an important part of society______it has even influenced our language.

Remember, boys and girls.The harder you work, ______.— Yes, Miss Gao.[ ]

Are you worried about her safety? —Just_______ She isn’t alone

When you phoned me, I was having a meeting, otherwise I _____your call.[ ]