TASK DEFINITION: You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.
PROBLEM: it isn't heavy i've got all my worldly goods in it but it isn't heavy and if it isn't carried in just a certain way the handle pulls out so i'd better keep it because i know the exact knack of it it's an extremely old carpet bag oh ____ very glad you've come even if it would have been nice to sleep in a wild cherry tree

SOLUTION: i'm

PROBLEM: madame danglars therefore went to bed ____ a shadow of suspicion and began to muse over the recent events in proportion as her memory became clearer the occurrences of the evening were revealed in their true light what she had taken for confusion was a tumult

SOLUTION: without

PROBLEM: whence you got a glimpse of the bloom white cherry trees in the left orchard and nodding slender birches down in the hollow by the brook was greened over by ____ tangle of vines here sat marilla cuthbert when she sat at all always slightly distrustful of sunshine

SOLUTION:
a