Rewrite the sentences without changing their meanings (using past simple or present perfct)
1.His father stopped smoking cigarettes when he was seriously ill
=> His father hasn't ..............................
2. Her sisters gave up eating too much fast food when then had trouble losing weight
=> Her sisters haven't .................................
3. The last time it snowed here was six years ago
=> It hasn't ........................
=> It last ..............................
=> It is .....................................
4. Mary last wrote to me last summer
=> It hasn't .......................
=> It last ..........................