Science is more than a collection of unrelated facts; to be meaningful and valuable,________ must be arranged to show generalized character.
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.