three questions1.I still remember the surprised look on his

three questions
1.I still remember the surprised look on his face when he was first (b) this kind of food.
a.brought b.introuduced c.given d.faced
explain it?
2.He expressed his own disappointment and (b) of the majority of the audience in a new year.
a.it b.that c.those d.one
explain it?
3.How long are you to be on the computer?
translate?
be on the computer--------be on?