If only I _____ a few days ago!Then I wouldn’t have been feeling so worried now.
She had to ______ their young children by herself after her husband died.
______ the money shortage, many small companies closed down.
With more and more forests ______ many animals are facing the danger of dying out.
You may not agree, but ______ I think she is a very good girl.
Hiking by oneself can be fun and good for health. It may also be good for ______ building.