You'll find it hard to get rid of the drug habit _______ you have it.
great efforts to practice English, Mary has made much progress in spoken English.
The organization serves _________ more than 3,000 children who would not have ______to music education.
---Look, Tom is annoyed again. ---You know, no one likes _________in public.
--- What are you reading there, Susan? --- Nothing interesting. I am just ________ the pages to kill time.
While riding in the street, _______________________________.