DNA sequence from the middle of a gene
TCT AAC TGA TTA GC

T CTA ACT GAT TAG C

TC TAA CTG ATT AGC

AGA TTG ACT AAT CG &lt;&lt;&lt; this is the ORF

A GAT TGA CTA ATC G

AG ATT GAC TAA TCG

If the sequence comes from the middle of a gene we assume it should encode an open reading frame.
For this sequence only 1/6 frames does not include a stop codon (shown above in italics). So in standard format, with promoter to the left we can write the ds sequence as:

5'-AGATTGACTAATCG

3'-TCTAACTGATTAGC

Since this is homework I'll leave the rest to you.