It is extremely difficult for them to cut down on smoking.
They find it (extremely) difficult / hard / impossible to cut down on smoking
The animals appeared ……………………………. when the flames surrounded them. (control)
Dick could not pass the examination because the questions were too difficult.
We decided that we wouldn’t go with him to the airport after all. (see)
It was such an interesting film that no one wanted to leave the cinema.
All members of our team played ……………………………., so we lost the game. (success)
The company offered assurances that it does not experiment ……………………. animals.