The big earthquake is _____ terrible blow toJapanese and people from all over the world feel _____ pity for them.

The twins looked exactly the same.Even I couldn’t ___ one from the other.

The final examination is coming up soon.It’s time for us to our studies.

Not until all the fish died in the river _____ how serious the problem of water pollution was. [ ]

How do you keep in touch with your friends— We ____________ write to each other, but we _________ chatting on QQ now.