A medical team was sent to Japan by air five hours ago.-So they ________ have arrived by now.The flight usually takes four hours or so.[ ]

Now that she is out of job, Lucy _____ going back to school, but she hasn’t decided yet.

The black horse is ______ of the pair.

I didn’t know your telephone number; otherwise,I ______ you long ago.

It’s nice of you to ___________ so much time showing me around your school.