How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?
Only when _______ according to the directions strictly will the medicine work well.
It is not immediately clear__________ the financial crisis will soon be over.
I’d like my bedroom __________ according to the fashionable style of Europe and America.
When asked why he went there, he said he was sent there ________ for a space flight.
My mom’s __________ determined me to go on with my study.