—Did you enjoy staying with your friend last week, Lily?—Yes. I________with him for a long time. [ ]

They had to ________ their lives against weather and wild animals. [ ]

It’s said that scientists are working hard to________ a way to deal with H7N9 avian influenza(H7N9禽流感)—Really That’s great!

I think physics is very difficult to learn. Do you ________ me

Why didn’t you apply for the job? —-I ________, but my old friend offered me a better one