Will the new iphone cost a lot?— I ________ think so. Apple’s products are usually expensive.

Tom, you look tired this morning. What’s wrong? —I was so busy that I didn’t go to bed _______ 12 o’clock last night. [ ]

How is the weather in winter in Bejing?—It’s ________.

What a nice model ship! – Thank you. It _________ me a few days to make it.

I called you yesterday evening, but nobody answered the phone.— Oh, I a walk with my parents at that time.