It is usually warm in Autumn here. But it _____ be freezing sometimes.
29. Can you say _____ certain when he will come here?
28. He is too careful _____ his money; he never buys a drink for us.
27. You should write the first letter of the sentence _____ capital one.
26. I called _____ you last night, but you were out.
25. The train leaves at 6:00 p.m., so I have to be at the station ____ 5:40 p.m. at the least.