we shuold use ____plastic bags to help the environment.let:'

we shuold use ____plastic bags to help the environment.let:' We should use（ ） plastic bags to protect our environment. We shuold collect some rubbish ____the environment .A.to hel We want to use( ) plastic bags.We want to be a friend of the What shuold we do to protect the wild animals? We mustn't use the things ____(pollute) the environment. 问一道英语题：Lei Feng was ______ready to help others. We shuold le We shuold buy our daughter a computer in ___it can help to i What do they use to check the bags? We found [ ] necessay to protect the environment. We want to use -------plastic bags,we want to be a friend of What can universities do to help to protect the environment?