11- Smoking can ( harm – lead to – occur – cause of) lung cancer and other diseases
12- The secret of his success is ( personal – solo – sociable – positive) thinking0
13- He didn't use to be so active. He ( is – has been – was – is being) always lazy0
14- My friend persuaded me to go swimming, (so – whatever – but – even though) I fell ill
15- I ( accuse – release – avoid – object). What you want to do can work against us in the end