By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.

 To our great relief, Jack’s illness proved not to be as serious as we ___.

His pale face suggested that he _____ ill and his teacher suggested that he ______to the hospital at once.

 This is his only request that the room ______ after being used．

—What do you think of our country?—Very beautiful.You know it is the first time that I    here.