A fireman discovered the______of the fire.A．truthB．reasonC．causeD．fact

The fireman acted quickly because lives were______.A．out of dangerB．in despairC．in dangerD

It has been discovered that the water ______ the coast of Fujian is rich in all kinds of f

To prevent a repetition of this dreadful occurrence, we must discover the ______ element i

In 1964－1966, major resource of natural gas were discovered in the British sector of _____

The jobs of wildlife technicians and biologists seemed ______to him, but one day he discov

The United States discovered in 1982 that about one-fifth of its farmland ______ topsoil a