It's ten years since the scientist _______on his life's work of discovering the valuable chemical.

    A. made for         B. set out        C. took off             D. turned up

It’s ten years since the scientist _______ on his life’s work of discovering the valuable chemical.

A. made for    B. set out?

C. took off     D. turned up?

It’s ten years since the scientist ____ on his life’s work of discovering the valuable chemical.

 It’s ten years since the scientist ____ on his life’s work of discovering the valuable chemical.

A．made for          B．set out            C．blocked out        D．turned up

It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical. 

It’s ten years since the scientist ________ on his life’s work of discovering the valuable chemical.

1. A.
   madefor
2. B.
   tookoff
3. C.
   setout
4. D.
   turnedup

It’s ten years since the scientist _______ on his life’s work of discovering the valuable chemical

1. A.
   made for
2. B.
   set out
3. C.
   took off
4. D.
   turned up