选择方框内的单词完成下列句子， 使句子通顺、正确。

A. knowledge  B. twentieth  C. largest  D.  written  E.  hungry  F uncomfortable.

小题1:Bruce is _______ , so he can’t go to school today .

小题2:He lives on the _______ floor . He uses a lift to go up and down.

小题3:China has the _______  population in the world .

小题4:The books _______ by Mr White are very interesting .

小题5:I’m not _______  , but I’m a little thirsty .

小题6:Our _______ of the universe is growing all the time .