Choose the best answer

11. __________pollution can directly cause hearing loss. *
a.Noise
b.Visual
c.Thermal
d.Soil
12. Australians _________English as their mother tongue. *
a.used
b.have used
c.has used
d.use
13. It’s the first time I__________ to China. *
a.am
b.was
c.has been
d.have been
14. __________ about the storm that stroke Thanh Hoa last week? *
a.Did you hear
b.Have you heard
c.Do you hear
d.Has you heard
15.The volcano could _________ at any time. *
a.hit
b.rage
c.erupt
d.strike