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