It may be a UFO____(land)on the Earth.

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ItmaybeaUFO____(land)ontheEarth.ItmaybeaUFO____(land)ontheEarth.ItmaybeaUFO____(land)ontheEarth.可以填l

It may be a UFO____(land)on the Earth.
It may be a UFO____(land)on the Earth.

It may be a UFO____(land)on the Earth.
可以填lands,着陆的意思,UFO是第三人称单数,所以加s