She was flirting with her boyfriend.
Cork can float on water.
Birds of a feather flock together.
A flock of wild geese flew overhead.
Bread is made from flour.
The flour was ground from barley.
He flourished his credit card.
The guard flourished his pistol at the crowd.
Rivers flow into the sea.
He is in bed with flu.
My weight fluctuates between 90 and 100 pounds.
我的体重在 90与 100磅之间变动。
He can speak fluent English.
Mercury is a fluid substance.
The river is flush with rain.
The noise made it hard for me to focus on work.
Try and focus your mind on your lessons.
His attempt to escape has been foiled.
The weather forecast says there will be rain.
He is one of the world's foremost singers.
I foresee that there will be problems.