—It’s not easy _________Mrs White to persuade(劝说)her husband to stop smoking. He never listens to others.—Really? It’s stubborn ____________ him.
She _______ when I went to see her.
We won’t go to the Great Wall until the rain _______.
I will give the message to him __________he comes back.
We won’t go to the Great Wall if it ___________ the day after tomorrow.
---What do you think Sam ________ in 10 years? ---A doctor.