下列各组字母中全部是元音字母的是 ____.A. a, e, o, r B. a, i, u, e C. o, u, e, n
--You didn't go to school yesterday, did you? --_____, though there was a heavy rain.
-- What happened to Jack? -- Hebecause of his drunk driving.
--Excuse me, could you please ______ shout in the classroom? --Sorry! I will keep quiet from now on.
Tom is __________ clever __________ he can answer all the questions.
________ plastic bags we use, ________ it will be to the environment.