A new form. of energy must be found _____ oil supplies will soon be used up.

Unlike other forms of narrative art, a play, to be successful , must give pleasure to its

As is known to all, there are many forms of energy, ______is solar energy.A．one of thatB．o

______ is a way in which new words may be formed from already existing words by subtractin

A: _____is at the door？B: It must be our new neighbor, Mrs. Lones .A. WhatB. WhoC. Which

A: _____is at the door？B－ It must be our new neighbor, Mrs. Jones.A. WhoB. WhatC. Which

New drugs or devices must be tested before being