When did your computer go wrong? -Last night, while I_______ some music from a website.

How about Beijing?—Beijing is cold this time ________.You need_______ warm clothes if you go there.[ ]

Who’s the girl in red?—Sorry, I don’t know ____. —____ is a new student.

Lily is _______shorter than her sister.

Is that boy Alan?—No, it ______ be him. He left for Beijing yesterday.