I like __________in the early morning when the air is fresh and I can take a walk around the garden. 

—Just a minute, Tom. Is this the report you need to hand in today?—Oh, yes, Mum. I thought I had put         in my school bag. Thank you.

This is such a letter ____came last night．

---Are the Smiths living in the house alone ?--- Yes, although they have three sons, _____ of them live with their parents.

---- Which of these digital cameras do you like best? ---- ______. They are both expensive and of little use.