activity前面是a還是an

activity前面用an

Does such an activity constitute a criminal offence?

難道這樣的活動也算刑事犯罪嗎

Completing an activity or journey完成一項活動或走完一段路程。

The office bustled with people and activity .辦公室里人來人往，忙忙碌碌。

These activities occupied most of her time .這些活動佔去了她的大部分時間。

The house was quiet， with no-sounds of activity .整幢房子悄然無聲，死氣沉沉。

Two couples undertake a leisure activitytogether .兩對男女一同參加娛樂活動。

I admire the activity of your benevolence .你完全是出於一片手足之情，我很佩服。