_______a rapid stream between the two hills.

Excuse me, Sir. Could you please tell me the way to the Bird Nest — ________ . I am new here. You’d better ask someone else.

Everyone _____ do his best for the modernizations of our country.

The Mekong River Commission has found no evidence thedams on the upper reaches have an influence on the water flow downstream.

Isn’t it time you got down to _____ the papers?[ ]