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124. Why don't we write about the three Rs?
125. It's fun to learn about recycling.
126. Renewable bags are not as cheap as plastic bags.
127. You should not throw old clothes away.
128. Don't forget to turn the tap off when you are brushing your teeth.
129. If you work hard, you will pass the exam.
130. If Henry fails his examination, his parents will be sad.
131. If Sue goes out this weekend, she won't have time to study.
132. If it snows tomorrow, I will go skiing.
133. If he leaves soon, he won't miss the bus.
134. If you play with matches, you will hurt yourself.
135. It's very exciting to live on Mars.
136. This is three times I have been to this restaurant.

137. You won't have to use computers because your TV will do everything.
138. Peter may not come to the party tonight.
139. I didn't have your number, so I couldn't phone you.
140. He has learned English for three years.
141. Da Nang is one of the richest city in VietNam.

Phần nào bạn không hiểu hỏi trực tiếp dưới phần cmt nhé, không giải thích từng câu vì nhiều câu cấu trúc giống nhau.

124. Why don't we walk around the Three Rs? 

125. It's fun to learn about recycling. 

126. Reusable bags are more expensive than plastic bags. 

127. You shoudn't throw old clothes away. 

128. Don't forget to turn the tap off when you are brushing your teeth.

129. If you don't work hard, you won't pass your exam. 

130. If Henry fails his examination, his parents will be sad.

131. If Sue doesn't go out this weekend, she will have time to study. 

132. If it snows tomorrow, I will go skiing. 

133. If he doesn't leave soon, he will miss the bus. 

134, If you play with matches, you will hurt yourself.

135. It's very exciting to live on Mars.

136. This is the third times I have been to this restaurant.

137. You won't have to use computers because your TV will do everything.

138. Peter may not come to the party tonight.

139. I didn't have your number, so I couldn't phone you. 

140. He has learned English for three years.

141. Da Nang is one of the best cities in Viet Nam. 

Bn học tốt!! Có gì không hiểu thì hỏi mình ạ ^^.