从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
第一节 单项填空 （共10小题；每小题1分，满分10）
21．He arrived late _____.
A. due to there was a storm B. due to the storm
C. because of there was a storm D. because the storm
22．— How did you learn to speak English so well?
— By practicing speaking _____ I had a chance．
A. whatever B. however C. whenever D. whoever
