鲜奶的奶香味主要是由于奶中含有的挥发性脂肪酸所致。( )
参考答案：对
Peter _____ come with us tonight, but he isn't very sure yet. [ ]
A. can
B. may
C. must
D. will
How I regretted ___the hours in the forest, ___I should have studied hard in the classroom.
A．wasting; when
B．to waste; when
C．wasting; where
D．to waste; where
