Most birds find it safe to sleep in the trees, but _____ they have eggs or young chicks, they don’t use a nest.
32. Now there are many _____ in our company.
29. ___ nice, the food was sold out soon.
24. Who is it up ____ decide whether to go or not?
23. Wang Mei is one of many Chinese teenagers _____ “on the go”
35. He was born ____ a very cold night _____ December.