The weather in Yang Zhou is much colder than _____ in Hainan in winter.

 ---We can use QQ to talk with each other on the Internet.---Really? Will you please show me         it?

—Is the blue ruler _______? —No. _______ ruler is red.

We don’t know _________. She is new here.

A report says the temperature on the earth now is much higher than _______ in the past.