.At the meeting they discussed different ______ to the study of mathematics.
It is quite impossible that it will rain tomorrow. But if it __________, I would still go to school by bike.
Had she __________ her promise, she would have made it at Beijing University.
Boys in early adolescence are not _________ to the cinema because the film is not suitable for them.
The rain was heavy and _________ the land was flooded.
With the ___________ of making a fortune, many Chinese came to Australia in the 19th century to wash sand for gold.