Some mountains are very hard to _________ (climb/vote)
climb
If no one can...........(solve/unsolve) this problem, we are in serious trouble!
solve
Sailing around the world alone is a great ________(adventure/adventuring)
adventure
Some sports, like football and car racing, are very hard on a person's______
(mind/body)
body
Who are you going (to die/to vote) for to win the competition?
to vote
It's very ____(difficult/easy) to reach the top of a mountain without help from other people.
difficult
Each year, many people ____(die/lie) trying to climb mountains.
die
Because Tina's......(minding/mind works very quickly, she does well in school.
mind
It can be difficult to find your way through a ____(forest/goals)
forest
Some kinds of ______(dangers/wild) animals are not afraid of people.
wild
Conservationists often need to.....(counting/count) the number of animals in certain areas.
count
If we don't do something about it, the elephant population will continue to...... (decrease/increase).
decrease
Many wild animals are in .....(wild/danger) because of the activities of people.
danger
Conservationists always hope to.....(discover/protecting) new animal populations.
discover
Most people are afraid of crocodiles, but it is still important ......(to count/to protect) them.
to protect
One of the goals of an explorer is.....(to teach/ to learn) about new places.
to learn
