As a scientist, Madam Curie devoted herself ________ to her research and that was why she was given two Nobel Prizes.

—I heard Charlotte had been drowned in the lake.—Really！Her boat turned______,and ______she couldn’t swim.

--- What a lot of fun it is to play on a frozen sports field! --- Isn’t it rather risky,       ?

I often thought of my childhood,             I lived on a farm.

I'm certain David's told you his business troubles. ______, it's no secret that he owes a lot of money to the bank.