30. Had it not been for the fact that I _____ absent, I would have asked you to do this right now.
The Red Cross is an organization _________ purpose includes offering help to victims (受难者) of disasters.
My mum would like me to go home early, but I ______ here a bit longer to enjoy myself.
Don’t waste your words any more; she is as ______ as a mule (骡子) and no one can persuade her.
The child asked his mother ______ go out to play tennis.
______ the tiger gets angry, it will be extremely dangerous.