【单选题】When I saw my teacher nodding _______ to me, I calmed down and went on with my performance.
【简答题】水稻根属 ______ ,有 ______ 和 _______ 两种。
【单选题】下面4个选项中,均是合法浮点数的选项是 。
【单选题】They finally managed to climb to the top,but __then.
A.
went the children down the hill
B.
down the hill did the children go
C.
down the hill went the children
D.
down the hill the children went
【单选题】As time _____ slowly, he was better and better. [ ]