(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.

It’s hard for him playing against me I’ve got nothing to play for, but for him, he needs to win so _____ [ ]

I wonder when it was __________ you came to realize__________ he said meant

Each different part of China has its own special forms of ______ art.

It is rather ______ that we still do not know how manyspecies there are in the world today.