1.	How often do lions breed?
	狮子多长时间产一次仔？
2.	When you're ill, wanting to get well again is often half the battle.
	生病时,有决心把病治好往往是最为重要的。
3.	On hot days we often bathe/go bathing in the river.
	天热时我们常在河里[去河里]游泳。
4.	Water-pipes often burst in cold weather.
	水管在寒冷的天气里经常冻裂。
5.	The assembly of cars is often done by machines.
	汽车常由机器装配。
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as often as not   往往，通常, 一贯
every so often   偶尔, 有时
more often than not   往往，通常, 一贯