Do you believe _______ (walk)on Earth is much heavier than on the moon?【附说明...】【好的加分...】等咱老师讲了再做决定吧!.....】

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Do you believe _______ (walk)on Earth is much heavier than on the moon?【附说明...】【好的加分...】等咱老师讲了再做决定吧!.....】
Do you believe _______ (walk)on Earth is much heavier than on the moon?
【附说明...】
【好的加分...】
等咱老师讲了再做决定吧!...
..】

Do you believe _______ (walk)on Earth is much heavier than on the moon?【附说明...】【好的加分...】等咱老师讲了再做决定吧!.....】
walking;
believe后面是其引导的【宾语从句】而walking on the earth是【动名词短语】,在宾语从句中做主语.

填that walking 。这是一个宾语从句 用that做引导词 ,后面的是真正的宾语。意思是你相信在地球上走路会比在月球上走路受到的重力大么?

walking

believe 后面引导宾语从句 本来要that做引导词的 但宾语从句里的that可以省略
至于walk加-ing是因为walking on earth在句中充当宾语从句的主语 要用动名词形式

walking
后面的是is
所以前面要用动名词