回答

① She has just moved into a new house.
「"今"ちょうど」なのでhas just moved. (現在完了形を使う )
had just moved.(過去完了形だと過去のある時点で終えていることになってしまうから✖️)
② English is spoken by many people.
③ They know how to speak Chinese.
④ He couldn't get along with his father.
  get along(仲良くする)
⑤ We tried to understand each other.

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