Blank out if no data

Please Help
How to hide an ID if no data.
ie
<tr><td>[Datefirsttrip]</td><td>[ReasonforTrip1]</td><td>[number-mileage-1]</td><td>[calculator-claim-mileage-1]</td></tr>
[technical-support-selected]
<tr><td>[DateNo2Trip]</td><td>[ReasonforTrip2]</td><td>[number-mileage-2]</td><td>[calculator-claim-mileage-2]</td></tr>

If id [DateNo2Trip], [number-mileage-2]< and [calculator-claim-mileage-2] are not used how can not display that line or not print IDs ref

Thank you
Richard