请将下列英语句子改成现在完成时的被动语态

4.The problem hasn't been solved by us yet. 5. The company's computers have been given away to a local school. 6.A kind of intelligent robot has been developed by the scientists. That's all! 3Q!

1.a new personal computer has been bought by my friend.2.my computer has been repaired very quickly.3.my computer has just been attacked by an unknown virus. 4.the problem has not been solved jet.

the company's computers have been given away to a local school. a kind of intelligent robot has been developed by the scientists.