There are altogether fifty students in our class,twenty（）There are altogether fifty students in our class,twenty（） are boys.刚刚上面的还没完整呢

There are altogether fifty students in our class,twenty（）There are altogether fifty students in our class,twenty（） are boys.刚刚上面的还没完整呢
There are altogether fifty students in our class,twenty（）
There are altogether fifty students in our class,twenty（） are boys.
刚刚上面的还没完整呢

There are altogether fifty students in our class,twenty（）There are altogether fifty students in our class,twenty（） are boys.刚刚上面的还没完整呢
There are altogether fifty students in our class,twenty（of them） are boys.
我们班一共有50个学生,其中20个是男生.
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总共有五十名学生在我们班，二十

boys/girls