These natural parks are very important for preserving many animals, which would _______ run the risk of becoming extinct.
It’s impossible for __________ few people to finish __________ a lot of work in only two days.
Simon made a big bamboo box __________ the little sick bird till it could fly.
The inspectors,__________ the book unhealthy for children,suggested it __________.
His __________ towards work left us a good impression.
What’s your attitude __________ that problem?