It's said that they have swum to the island from the continent, but they______(不可能做到) because the ocean in between is too wide. (do)

单项选择题There were many talented actors out there just waiting______.

填空题______(正如我们强调的那样) many times, serve the people is our first policy. (stress)

单项选择题Doctors say that exercise is important for health, but it ______ be regular exercise.

填空题Last night's TV news said that by then the death of the missing people______(未证实) yet. (prove)

单项选择题Not until he left his home ______ to know how important the family was for him.