The stronger the______ for acquiring language skills is, the more quickly a language beginner will learn. 

You have been sitting on my hat and now it is badly out of     _____      .

Many nations have promised to reduce greenhouse gas emissions, but are falling short of the _______ reduction of 25 to 40 percent of 1990 levels.

 Bill was doing a lot of physical exercise to build up his _______.

.Having heard the customers’ ________, they decided to improve their products.