CH7A INSTRUCTOR AND TRAINEE LANDED ON A CLOSED RWY AT RHV.

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FLT DEPARTED RHV FOR CURRENCY PRACTICE OF PVT PLT IN FRONT SEAT. PLT HAD NOT FLOWN WITHIN 90 DAYS SO WANTED AN INSTRUCTOR ALONG. RWY 31R WAS CLOSED BECAUSE OF A GRASS MOWER IN THE VICINITY OF THE RWY. WE WERE 'CLRED FOR TKOF RWY 31L; MAKE R TFC.' WE ASKED FOR L TFC; BUT THE TWR DID NOT HEAR US; SO WE MADE R TFC. JUST AS WE TURNED DOWNWIND; TWR CLRED US TO LAND RWY 31L. STUDENT WAS HAVING SOME CTL PROBS FROM LACK OF RECENT EXPERIENCE AND WE WERE DISCUSSING THIS AT THE TIME WE RECEIVED AND ACKNOWLEDGED THE LNDG CLRNC. ON BASE LEG; STUDENT WAS STILL HAVING CTL DIFFICULTIES (LOW AND SLOW) AND AGAIN THIS WAS DISCUSSED (INTERCOM USED). WE LANDED UNEVENTFULLY ON THE R RWY. AFTER LNDG; TWR INFORMED US WE HAD LANDED ON THE CLOSED RWY. CONTRIBUTING FACTORS: 1) R TFC FOR L RWY. 2) COCKPIT DISTRS. 3) NO 'X' ON RWY OR WORKING ACTIVITY NEAR CLOSED RWY. 4) TWR NOT LETTING US KNOW OF OUR ERROR ON SHORT FINAL. 5) PLT STRESSED FROM NEW CHILD. 6) INSTRUCTOR STRESSED FROM RECENT DEATH IN FAMILY AND OTHER STRESSFUL EVENTS. CORRECTIVE ACTIONS: PAYING MORE ATTN TO RWY CLOSURES; ESPECIALLY WHEN RWY NOT 'X'ED.' REDUCING STRESS LEVELS BEFORE FLYING; DISCUSSING THESE EVENTS WITH THIS AND OTHER STUDENTS SO THIS WILL NOT BE REPEATED.