1. Remember to drop us a line !
* write to sb = drop sb a line
2. I think you've got the wrong end of the stick this situation.
* misunderstand = get the wrong end of the stick
3. The fox tried in vain to reach the grapes.
* in vain: vô dụng
4. The bank robbers made a getaway in a stolen car.
* escape = make a getaway
5. I wasn't in favor of the idea.
* agree with = be in favor of