6. David uses English as his mother _______ because he comes from the UK. A. tongue B. mouth C. nose D. cheek 7. I find it hard to understand that foreigner because of his ________. A. voice B. sound C. accent D. volume 8. I _______ Sydney Habour twice, so this time I think I _______ to a different place. A. have visited-will go B. have visited-will be going C. visited-will go B. visited-will be going 9. It won’t be possible to save the Earth if we don’t take______ right now. A. action B. job C. work D. duty