Happiness and success_____on ourselves, and we mustseize the chance.[ ]

21He is very strict with others, but he is always blind _____ his own shortcomings

Where ___________go this summer —I’d like to go _________ warm.

It is human activities on the earth that areto _______ global warming.

. —How’s your tour around the North Lake? Is it beautiful?—It __________ be, but it is now heavily polluted.