Mets les verbes entre parenthèses au present perfect et choisis entre since et in (take) part in different events since / in the last two years and 2000 kids (be) a member of WWF since / in 2010. More than a hundred people (sign) my climate change petition since / in last week and more the (watch) my video about global warming since / ini pered (write) several articles for a children's of the Internet. And since / In the past few months
