Look! The light is still on. Is Mr Wu working in his office？—No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.

Go straight ahead and turn right _____the second turning. [ ]

I think he draws very well. _____ he is only 4 years old. [ ]

We _________ for a picnic if it _________ rain this Sunday.

You must read the ___carefully before taking the medicine.