It is well known to all that water, ______ enough, can change into ice quickly．

Who helped Jessie with her English? —_________, she taught herself.

What would you like to do this Sunday?—–If it doesn’t rain, I _______to Mount Qingyun for a spring field trip.

Do you speak English _________?—Yes, I do. I can speak very _________ English.

I believe ____________, because he is ________honest man.