__________it was so cold, he went out without an overcoat.
A. If
B. Since
C. Although
D. Because
KEY C
Giải thích: although nối 2 vế tương phản về nghĩa
Dịch: Dù trời lạnh nhưng anh ấy vẫn ra ngoài mà không mặc áo khoác.
Put plants ............... a window so that they will get enough light.
If you can give me one good reason for your acting like this, _____ this incident again.
His teacher regrets _______ him that his application for the job has been turned down.