1 . Recently, sales of things with dragon elements have witnessed an ______(explode) growth on e-commerce platforms. (所给词的适当形式填空)

2 . ________(explode) materials must be kept far away from fire. (所给词的适当形式填空)

3 . You are not allowed to carry any ________ (explode) or dangerous things into the cable car. （所给词的适当形式填空）

4 . These are volcanoes so ________(explode) that they burst open in a single big crack, leaving behind a vast hole, the caldera. (所给词的适当形式填空)

5 . The ________ (explode) news that the manager quitted the job made the staff astonished. (所给词的适当形式填空)

6 . It is said that renewable energy will continue its ___(explode) growth in 2021. （所给单词适当形式填空）