Go back to your room and leave me                  I like being by myself.

These natural parks are very important for preserving many animals, which would ______ run the risk of becoming extinct(灭绝的)．

Time is pressing. Although the weather was terrible, we carried on the work ________.

A good “teammate” doesn’t ____ make a good partner. Those who put their partners in this category were most _____ to describe their relationship as slightly unhappy. 

Professor Lee failed many times but he ________found a good way to solve the problem.