30. Jennifer, who is my best friend, said she would go abroad for further education __________.
Millions of people have been forced to leave their homes ______ the heavy storms and floods.
Our club is open to adults only. ______ your children have entered without permission.
He _____ have gone to Shanghai, for I saw him a moment ago.
Nowhere _______ find the necklace ______ by her husband in celebration of their tenth wedding anniversary.
We need to put safeguards ______ to prevent this type of accident occurring again.