Mr. Smith was ________ UNICEF officer. He came to the village and changed the poor girl’s life.

Earth is believed ______ by an object the size of Mars at some point in the distant past before its surface cooled. [ ]

The reason ______ Old French made contributions to Middle English is ______ English borrowed many words from it.

Our English teacher is very strict _____us and he is strict_______his teaching.

miss this chance, it may be years ____ you get another one.