The young man stepped into the office ,___down and began to fill in the forms.

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The young man stepped into the office ,___down and began to fill in the forms.
The young man stepped into the office ,___down and began to fill in the forms.

The young man stepped into the office ,___down and began to fill in the forms.
过去式用sat

( sat ) down----------------坐下来

sat 因为是过去得一连串的动作。句式是这样的:did ,did and did .先进办公室,然后坐下,然后填表格。