__________ the traffic jam, he arrived on time.

______ what we have now, we can’t afford so large a house.

If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.

. Lion: Want to have a fight, little dog?
Dog: No. I don’t want to fight an animal that is ______extinction(灭绝). My master told me that we should protect endangered animals.

I didn’t quite follow him because he explained the theory _____that is too abstract for me.

By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ____appeared a rare rainbow soon.

．Jack was still very calm, ______ the quarrel with the boss, and greeted every person he met on the way back to his office.

He lost his job, along ______ hundreds of others, when the company closed.

I have an itch ____ writing.      

. Color of skin and sex are hardly relevant _____ whether somebody is suitable for a job.