Vegetables are cheap______when they are in season.A．to buyB．to buy themC．buyingD．to be bou

When the propeller blades are integral with the hub, the propeller is called a _____.A.bui

When considering the lowest fuel system operating temperature, _____ are important.A.speci

When bonds are issued ____ a discount, the borrower must repay more than the amounto

The findings of the experiment show that ______.A．errors are more likely when a referee ke

Stars are so far away that they are _________ spots of light when seen from the earth.

Fares are cheap; they ______ Im told for almost a hundred years.