How often ___________ the Olympics_____________?—Every four years.

Jerry did not regret giving the comment but felt ________ he could have expressed it differently.[ ]

Is it necessary to look up every new word when I come across it in reading?—No. You ________， because you are likely to guess the meaning from the context.

When spring comes, the days get________.

See the flags on top of the building?That was______we did this morning．