It is the protection for the trees___________ really matters, rather than how many trees are planted.
Though the man was badly hurt in the accident, he was still ______ and could think clearly.
- Could you do me a favor? - It depends on ______ it is.
Over the past decades, the sea ice ______ in the Arctic as a result of global warming.
Giving up smoking______the risk of heart disease.
Further measures will be taken to ______ our streets of crime.