_________ did the students realize that they were mistaken about spiders.

The experts think that India’s populationmay be _______than China’s ______ 2020.

Zhengzhou Subway Line No.1 ___________ last year. It has eased（缓解）the traffic pressure greatly.

Mary, what ______in your hand—Look! It’s a new iPad for my daughter.

Excuse me. Where is the stair— Ok. Go straight ____that door under the EXIT sign.