________ these experiments were successfully completed would we think of going into humans.
Some 1,000 new words or usages join the English language each year. Some go into the dictionary. Others _______ from use.
7. You should put on the notices ______ all the people may see them.
6. _____ I suggest, he always disagrees.
5. “Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”
4 You will succeed in the end ____ you give up halfway.