选出最适当的单词填入空格内.
1 Most flowers would perish when ( ) comes.
a.winter
b.summer
2 Experts know a lot about ( ) things.
a.special
b.general
3 They look so ( ) each other that we thought they were twins.
a.alike
b.unlike
4 I was most grateful to John for his ( ) .
a.kindness
b.cruelty
5 Most ( ) turn purple when they ripen.
a.apples
b.grapes
答案：a a a a b