145. The problem couldn't solve because it was too hard.

146. They can't reach the village by car.

147.  Because the question is too hard, I can't answer it.

148. No one wanted to go out because it was so cold.

149. I haven't gone to Hanoi for 2 years.

150. When have you been here?

151. Nga woke up too late, so she didn't have time for breakfast.

152. Many people go there on weekends because they want to have a rest after a hard working week.

153. She is such a bright student because she can do almost the exercises in this book.

154. The weather isn't good, so we can't go on a picnic.

Chúc bạn học tốt ~

# Yumi

=>
145. The problem couldn't be solved because it was too hard.
146. They can't reach the village by car.
147. Because the question is too hard, I can't answer it.
148. No one wanted to go out because it was so cold outside.
149. I haven't gone to Hanoi for two years.
150. When were you here?/ When did you get here?
151. Nga woke up so late that she didn't have time for breakfast.
152. Many people go there on weekends because they want to have a rest after a hard working week.
153. Because she is a bright student, she can do almost the exercises in this book.
154. The weather is so bad that we can't go on a picnic./The weather isn't good, so we can't go on a picnic.