90.Problem solving, like other mental activities such as creativity, is hard to _______ but generally easy to recognize.

10.No one can finish all the tasks alone. Don’t ______ to ask for help. We can all benefit from cooperation.

9.The skin on our body is a good _______ to the virus, unless it is broken or cut.

8.Last week I submitted my first project proposal and I was very anxious to know how the department manager would ______ it.

7.Our mutual friend John has got a rare ability to ______ facts and figures.

6.Traffic jams often build up when drivers ______ down to see what happened in a crash.

5.We aim to do better at _______ the limitless power of the sun.

4.The company’s new products are _______ in the countryside.

3.They are working on a new project, which calls for a( ) _______ amount of time and energy.

2.The city officials drew up and _______ a plan to promote creativity through the maker movement.

1.SB.and Jeannie used to live together, but recently they have been ______ for the first time.