There is still a long way to go to work out all the problems the conservation of naturalresources. [ ]

92 The international police has come into existence and they were ____ the key to global security

________．How can I get to the bank—Just go straight and you can find it.

Wehavebought so much food now that Tom won’t be with us for dinner.

________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that