45. My sister is ____________　 ________(擅长于) singing.

44. They ___________ ______________(去游泳)last Sunday.

43. I am ___________ ____________(寻找) some water.

42. How often do you eat fish ? About________(两次)a week.

41. She usually ______________(乘) a subway to work.

40. Give me a _____________(对)of socks.

39. What did you buy yesterday? I ____________(买)a pen.

38. She has a bag of _______________(薯条).

37. Jim ________________(居住)in Beijing.

36.I am going to ______________ (寄)a letter to my friend.