1.The visitors seem happy to knock on the wooden houses to see if it is real wood. If you are the resident of that house, that is not pleasant, of course.
knock on敲击
He went up the garden path to knock on the door.
他穿过花园小径去敲门 。
2.The rules include not photographing residents without permission, not strolling into their gardens and not dropping litter.
without permission未经许可;[法] 未经许可
They cannot leave the country without permission.
他们不能擅自离开该国家 。