51. be afraid of making mistakes/be afraid to make mistakes/be scared of making mistakes

　　52. will try to finish the task

　　53. It takes me at least an hour

　　54. speak both; and / speak not only; but also/not only speak; but also speak

　　55. too busy to have a word with/ so busy that I couldn’t have a word with

　　56. I don’t think it’s time to fully depend (rely) on; it’s necessary (for us)

　　57. It’s necessary for us to stop (prevent) the children (from) spending;

　　It’s necessary for us to keep the children from spending

　　58.helps us so much that we all regard him as

　　59. Thank you for providing me with good suggestions / advice about study in time

　　60. didn’t do his homework until he picked out as many difficult points as possible in the notes

　　and went over them