* 17. The train sometimes late. O arriving
O arrived
O arrives
O arrive
O have arrived​

O arrives

Explanation:

The train sometimes arrives late

  dante alighieri wrote the divine comedy, a description of a spititual journey. when he wrote it , he was in exile. in florence, dante's native city, there was a social strife, they had political turmoil, and some of the   florentine names included in the narrative may have been a way that dante used to criticize his fellow citizens.

1- cleans/ tidies up

2- were

3-would be

4- had known

5-takes

6-must be/ have to be/should be