英语翻译4.Must we fill these baskets with eggs now?(变为被动)Must __

英语翻译
4.Must we fill these baskets with eggs now?(变为被动)
Must _____ _____ ______ ________ with eggs now .
these baskets be filled
这句话意思?还有这个选择题为什么选D,可能我意思不懂吧,
( )2.— Is Mars bigger than the earth?
— No ,It’s about the earth?
A.as big as B.as bigger as
C.the same big as
D.a quarter as big as