I know one of the things I was unsure about was _____hard it would be to climb this mountain.

Do you know the popular TV show Hua Qian’gu ______ its sequel(续集) next year— Really I can’t wait to watch it.

When ____ to danger and conflict, men tend to increase blood pressure, _____nervous or anxious[ ]

I don’t know if he______tomorrow. If he ______, I______ you konw.

Bad luck! ________ I want to see that terrible big dog, ________ frequently I meet it [ ]