—Here are three books on history. Which one would you like to borrow?—______. You see, I’m interested in geography these days.

She writes ___ from time to time.

 The sunspot came into its active stage, __________ that happens once every eleven years.

---It’s a lovely day, isn’t it? ---Yes. I love ___when the weather is warm and sunny in winter. Why not sit outside and have a chat?

To save class time,our teacher has_______students do half of the exercise in class and complete the other half for our homework.