He was inexperienced and lack of preparation, so his first experiment was（）to fail.
Nobody likes insects. They are（1）and sometimes dangerous. Some of them bite us and give us（2）; others bite us and give us big red spots. Some do not bite; but they just fly around our heads or crawl around our houses and gardens. And we do not like any of them（3）those lovely butterflies.But insects are interesting. First they are very（4）animals. Three hundred and twenty million years ago there were no men and other（5）in the world but there were insects. Today, on every square mile of land there are millions of them flying and crawling（6）. Second, insects are very（7）to their habitat, to their food and to the weather. Now there are about a million different species in the world. Then（8）do people use insecticides?Not many insects hurt us. In many cases we do not see the insects and we do not think much about them. The（9）is that insects eat so much of man’s food（10）there are so many billions of them. So we must use insecticides to（11）them.An insecticide is simply a special chemical（12）with some poisonous elements. Farmers（13）their crops very often and the insects die very quickly. Of course some poisonous chemicals（14）on the crops or in the（15）, and that is also dangerous to our health.
With the combination of intelligence and （ ）skills, people have found ways to use plant and animal resources, mineral ores, fuels, and many other of Earth's materials and resources.
The three climbers can employ a guide to（ ）them on their way up the mountain.
Wrestler Jake “The Snake” Roberts told TMZ.com that he will（ ）emergency surgery to remove a cancerous tumour.
At last she left her house and got to the airport, only（ ）the plane flying away.