46. This coat was in a sale when I bought it so it was very cheap. ( trong một lần giảm giá )
47. Why do you persist in blaming yourself for what happened? ( khăng khăng, cố chấp )
48. Mr. Smith cannot be here, so his wife will accept the prize on his behalf. ( thay mặt cho ai )
49. The police took the burglars by surprise. ( tình cờ, bất ngờ )
~Xin hay nhất ạ~