----- Nội dung dịch tự động từ ảnh -----
1. It is not necessary to set off early today.
-> You don't .
2. Lim Festival is a Vietnamese festival. It attracts lots of foreign tourists. (however)
3. If we don't hear from you within seven days, the order will be cancelled.
-> Unless
4. They usually visit museums when they have leisure time.
=> They enjoy