In some cases,different approaches ________ the same scientific problem lead to conflicting theories.
—Mum, I hope we can spend our holiday abroad this year. —______ I’m too busy to take a trip abroad.
Do you remember the place _____ we visited last year?
I request that you __________ the task on time.
This is the first time wea film in the cinema together as a family.
The education of _______young is always _______ hot and serious topic in modern society.