根据中文提示写出单词或词组，使句意完整、正确。
---Do you often play computer games?
---No. My mom ________________(允许) me to do that only on weekends.
---Look, Mike. Are those doctors from Africa?
---No. They are _________(德国人). They have just come back from Africa.
There are some ____________(机器) making loud noise.
Sleeping too late  ________________ (有害的) your health.
As we know, the plants are hard to live in a _____________(干燥的) place.