----- I am certain David has told you his business troubles. ----- ______, it is no secret that he owes a lot of money to the bank. 

Sometimes parents’ control of young kids will be thought to be such an invisible rope, with which to tie them tightly, that they _____ tried to cut it.

Tonny’s parents thought he was at school, but ______ he was in an Internet bar.

I don’t like her face;        , she smokes, which is something I hate.

His report was so exciting that it was      interrupted by applause(鼓掌).