61._________A.. cheapB. cheaper C. cheapestD. the

In manufacturing, cheaper materials are being substituted ____ the better.

According to Charles, people send messages via facsimile because ______.A．it is cheaper an

The second paragraph focuses on the fact that ______.A．fossil energy was once very cheapB．

If you want to make a cheaper daytime call, you should ______.A．ask the operatorB．change t

Brazilian coffee is usually ________ by ships because this way is cheaper.A. tradedB.

_________(61)A.the B.anyC.some D.a