A)根据句意和所给汉语释义写出单词。
36. Once opened, this __________ (产品) should be kept in the fridge.
37. The salesman wanted the __________ (顾客) to make a choice at once.
38. The number of __________ (私人的) cars has increased in China in recent years.
39. It is said learning to play a musical instrument can improve a child’s __________ (大脑) development.
40. The telephone __________ (账单) was paid and I could use my phone again.

B)根据句意，用括号中所给单词的适当形式填空。
41. You should look up the word in the dictionary when you are __________ (sure) of its spelling.
42. My grandfather is __________ (forget) and often repeats himself when he tells a story.
43. The last two lines of this poem don’t rhyme __________ (proper).
44. Look! The machine is running __________ (smooth).
45. They accepted these __________ (paper) and suggested only a few changes.

五、根据汉语意思完成句子
46. 得知您的机器人染上病毒，我们感到抱歉。
We’re sorry to hear that ______________________________.
47. 你应该尽早把电池装进去让它工作。
You should ______________________________ to make it work as early as possible.
48. 家里有了机器人，她不再为家务活烦恼了。
With a robot at home, she ______________________________ the housework.
49. 我决定明天请人修理我的电脑。
I decide to ______________________________ tomorrow.
50. 我想知道本周末先参观哪个名胜。
I wonder ______________________________ this weekend.