For most people, it’s very difficult to _____ air on the top of Qomolangma.

What is the newcomer like? —His manner isto offend everyone he has met.

I can’t find my pen. Could you help ________ find it?

Is it going to rain tomorrow?– If it, we’ll have the match next week.

Joy, what happened to the plane? It ___ at midnight, but it didn’t land on the airport on time.