As we all know, apples are sold by ____ weight, and socks are sold by _______dozen.

Why weren’t you at the meeting? —I for a call from my husband in Guangdong.

Alan is a careful driver, but he drives _________ of my friends.

.I think _________ of the materials I listened to at the beginning of the exam ____ easy.

Why was Miss Read so angry with you this morning?—She asked me _______.