—The exam was very easy, wasn’t it? —Yes, but not ________ could pass it.
It’s not wise ______ think you are always right.
It’s impolite to read _______ letter .
I was ________to watch the ________football match yesterday.
----Can you understand my words? --- Sorry, I can ______ follow you.
----- I don’t think waste water should be put into the rivers or lakes. ----_____.It will cause much water pollution.