Mountain climbing must be very tiring, ________,you might feel sick with the air getting thinner. 

Mark’s fluency in English gave him a big advantage________the other applicants for the job. 

John is not here today .Who can       him in the game?

---It was careless ___ you to have left your clothes outside all night.
--- My God! _____.

I haven’t been my cousin for ages and he has changed     recognition.

35. Many people helped me.______, I succeeded.

A．In turn

B．In a result

C．As a result of

D．As a result

33. Once ____you may feel uncomfortable.

21．I’m vey busy toady. ______,I have much work to do today .

Though he is in his late sixties, the well-known biologist begins each day ____ a sense of adventure and a sense of curiosity.

My friend Martin was seriously affected by a strange fever; _____ , he could neither eat nor sleep.