How amazing it is that astronauts are exploring outer space!-It’s a challenge, I guess, _____ man against nature.[ ]

It just isn’t fair；________I was working as a waiter last month，my friends were lying on the beach.

Mr. Wang is a teacher. He ______ in this school for 20 years.

Thanks for your help.— ________

To prepare for the Olympic Games in summer, London ____ its largest ever exercise to test the response of emergency services.[ ]