Express the following with a lesser degree of certainty. Example: Biotechnologies will considerably lessen pollution

1 Petrol-fuelled transport is likely to be prohibited in the 21 century. 2 Experiments made on space stations arc likely to lead to many unexadvances in science.3 Human-like robot servants arc unlikely to take over from real people. 4 Domestic robots are likely to take care of the old and disabled.5 .. .people are unlikely to substitute taking nutrient pills for eating meals. 6 Virtual reality is likely to be used for treating some psychological problems.