A:to invent
B:inventing
C:to have invented
D:having invented
A. B. C.
D. E.
①____ ②____ ③____ ④____ ⑤____
He lost his key. It made him ________ in the cold to wait for his wife's return.
如图,动点P从(0,3)出发,沿所示的方向运动,每当碰到长方形的边时反弹,反弹时反射角等于入射角,第一次碰到长方形的边时的位置为P1(3,0).
看拼音,写词语。
shí jié
fēng yǔ
rùn huá
nǎi zhì
qián shuǐ
____