Ⅰ.用适当的介、副词填空
1．A healthy environment is important ________ our survival.
2．________ how many times has the world’s population increased since 1800?
3．Much sea life is being destroyed by fishing boats ________ well.
4．These boats catch large numbers of fish ________ giving them time to lay eggs.
5．They think of greedy businessmen hiding ________ their responsibilities and only worrying about money.
6．We need to stop thinking of companies and businessmen ________ the enemy，and give them more credit!
