I don't understand what the engineer means, but I’ve got    rough idea of  Project plan.

A. the; a  B. 不填； the  C. the；不填  D. a; the

Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

A. a; a      B. a; the      C. 不填; a      D. the; 不填

My neighbor asked me to go for ______ walk, but I don’t think I’ve got ______ energy.

A. a; 不填                    B. the; the                            C. 不填；the        D. a; the

I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

    A. 不填；the      B. 不填；a      C. the；不填     D. the; a

 Have you heard ___ news? The price of____petrol is going up again！

A. the, the      B. 不填，the    C. the, 不填    D. 不填，不填