No matter how low you consider yourself，there is always someone _______ you wishing they were that high.

The astronauts started their journeys in rockets _____forward by jets of hot gas

Wehaveto________thewheatassoonaspossiblebecauseastormisontheway.

h, the classroom is so dirty. Itneeds ______ before we begin our class.

The book is of great value. ______ can be enjoyed unless you digest it.