A．regularB．oftenC．usualD．incidental

A．neverB．oftenC．everD．now

【C8】A．fictitiouslyB．preliminarilyC．ultimatelyD．incidentally

【C11】A．alwaysB．oftenC．sometimesD．never

What does the word "serendipitous" in Paragraph 8 mean？A．Incidental.B．Suspicious.C．Delight

【C17】A．regularB．habitualC．customaryD．popular

【C15】A．occasionalB．frequentC．usualD．regular