1.Taking photos in the museum is prohibited
-You can't taking photos in the museum
2.He is flying to Ho Chi Minh City to visit his aunt and uncle
-He is going to visit his aunt and uncle in Ho Chi Minh by plane.
3.It's very dangerous to walk alone after 10p.m in that park
-You should't go to walk alone after 10p.m because it's very dangerous.
4.Angel Falls in Venezuela is higher than any other waterfalls in the world
-Venezuela's Angel Falls is the hightest waterfalls