Look! Who is the man in the picture（图片）?——I know. ______ Zhou Xingchi.

Zhang Lili, “the most beautiful teacher”, has moved us deeply. — Yes, and she is ______ popular with her students.

She has written a lot of books, but_______ of them is good .

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

I can still remember ______ it was so long ago.