1.   Crack is a cheaper, smokable form which is powerfully addictive.

2.   Crack is a dangerous drug because it is initially very addictive and because of its enormous financial cost.

3.   Crack is a highly addictive form of cocaine.

4.   The earth was so parched that there were huge cracks in it.

5.   There were cracks in the walls and the steps up to the entrance had been reduced to an uneven and rocky slope.

6.   Crack is a much cheaper, smokable form of cocaine which is powerfully addictive.

7.   Crack is the most addictive drug on the market.

8.   There were huge cracks in the plaster, and the green shutters were faded.

9.   There were cracks in the brickwork.

10.   The metal is then minutely examined to ensure there are no cracks.