Lời giải:
Đáp án: at
Giải thích: at the back of: ở phía sau của...
Dịch: Những cuốn sách ở phía sau thư viện bằng tiếng Anh.
It's a good thing you lent me the money or i would have had to go to the bank.
=> If _________________________.
Rewrite the following sentences using question words + to -infinitives.
The rules didn't specify who I should speak to in case of an emergency.