_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.

A. Only if; you will                       B. Only if; will you

C. Unless; you will                       D. Unless; will you

Nowhere else _____ be able to find a larger display of sea animals, including one of the largest collections of sharks in the world.

   A. you will           B. can you         C. could you          D. will you

     you eat the correct foods    be able to keep fit and stay healthy.

A．If only; you will    B．only if; will you   

C．Unless; you will D．Unless; will you

“Only two centimeters higher,         break the world record.” encouraged the coach.

    A．you will         B．and you will       C．or you will         D．will you

______ you eat the correct foods ______ be able to keep fit and stay healthy.

A. Only if; you will   B. Unless; you will   C. Only if; will you    D. Unless; will you