第一册
Lesson 1-4
Lesson 5-8
Lesson 9-12
Lesson 13-16
Lesson 17-20
Lesson 21-24
Lesson 25-28
Lesson 29-32
Lesson 33-36
Lesson 37-40
Lesson 41-44
Lesson 45-48
Lesson 49-52
Lesson 53-56
Lesson 57-60
Lesson 61-64
Lesson 65-68
Lesson 69-72
Lesson 73-76
Lesson 77-80
Lesson 81-84
Lesson 85-88
Lesson 89-92
Lesson 93-96
Lesson 97-100
Lesson 101-104
Lesson 105-108
Lesson 109-112
Lesson 113-116
Lesson 117-120
Lesson 121-124
Lesson 125-128
Lesson 129-132
Lesson 133-136
Lesson 137-140
Lesson 141-143
believe
v.相信；认为
may
（用于请求许可）可以
how long
多长
since
prep.自从
why
ad.为什么
sell
v.卖；出售
because
conj.因为
retire
v.退休
cost
v.花费
pound
n.英镑