VI. Complete the sentences(10)
61.I was worried about whether I would ____ _____ ____ ______.（失业）
62. Would you please _____ _____ ____my flat for a visit? （来）
63. Our environment is getting worse. ________ ____ _____(因此) many endangered species are now dying out.
64. Such knowledge is still useful _____ _____ _____ ( apply )similar situations in other countries.
65. Long before humans _______ ______ ______（形成）, there existed a varity of animals and plants.