We should do what we can to save those _____ species, including the tiger, an animal which was considered _____ to humans.
34. Wild animals have been overhunted, and as____result, some of them are among the animals in ______ danger.
33. Nowadays, use____of certain waste materials to protect the environment.
32. I suggested that they set off early to avoid (避开) the traffic jam, ____________ no one responded.
31. How to solve the problem __________ in the meeting right now
30. He’s making_____great progress in his lessons that everyone else in his class can’t believe it.