Don’t waste your words any more; she is as ______ as a mule (骡子) and no one can persuade her.
The next bus will come 20 minutes later. __________, let's go therefor a coffee.
At minus 130℃, a living cell can be __________ for a thousand years.
—Mom, Tom asked me to play football with him. Shall I go out now? —__________. Be careful and don't play in the street.
We must __________ him to be innocent until he is proved guilty.
__________ he knew that his children would not find their way back this time.