The car accident happened ____ a cold winter morning. Luckily, no one was hurt.

Do you know _____?—Sorry, I don’t know.

Talking loudly in a library is impolite.—In fact, we should also take care not to cough or sneeze loudly in public.

Whose hair band is this ? ________ it be Kate’s ? — I’m not sure . It ________ be hers.

Is this your earser?—No,it isn’t. It’s ________.