__ with such great difficulty, Jack felt at a loss ___.
It is hard to avoid mistakes. you correct them, it will be all right.
Ivy told Nancy that she what she was doing during the vacation.
Tom is an aggressive but easygoing person, will succeed whatever career he chooses.
----- Believe it or not, my sister and I are twins. ----Oh, you must have had the case ________ you were taken for your sister.
_____ you are in a speech contest or you are giving a talk in class, a little preparation will make your presentation organized and dynamic.