3)this is (more delicious , the most delicious)cheese-cake l have ever had! 4) Do you feel (better;the best ) today than yesterday ? 5) l think my cat is (prettier; the prettiest) of all the cats in the world . 6) this week the weather is (hotter; more hot ) than last week. 7) Our new house is ( more beautiful; beautifuller ) than the old one . 8) maths is (harder; the hardest) subject at school.

Do videoconferencing programs enable users to talk to and see each other?
Videoconferencing programs enable users to talk to and see each other, don't they?
What enables users to talk to and see each other?
Who do videoconferencing programs enable to talk to and see each other?
What do videoconferencing programs enable users to do?
Videoconferencing programs or special equipment enable users to talk to and see each other?
What programs enable users to talk to and see each other?
Who do videoconferencing programs enable users to talk to and see?
What do videoconferencing programs do?