根据汉语提示，写出考试范围内教材规定单词的正确形式。
【小题1】How can the athletes enjoy ___________(竞争) in the Winter Olympics?
【小题2】Chinese scientists have not given up the dream to ___________(探索) deep space.
【小题3】I have _____________(替换) the old tyres with new ones.
【小题4】___________(无论如何), I must finish the job today.
【小题5】You’d better use the __________(电子的) calculator(计算器) to get the total number.