Give the correct form of the word in brackets.

He visits his parents __________ (frequent) now that he lives abroad.

This room is (big) __________ than that one.

She spoke __________ (confident) than her classmates during the debate.

His work is _____ (accurate) than his colleague's, so he needs to be more careful.

This exercise is __________ (challenging) than the one we did last week.

This exam is (bad) __________ than the last one.

Her performance today was _____________ (impressive) than the previous days, so she felt sad.

Our class worked __________ (hard) this semester than last semester, which explains the better grades.