3. The kangaroo has been known as a symbol of Australia …………… 1773. A. since B. from C. for D. in 4. We should wear …………… when you go to concerts or other loud events to reduce the effect of noise pollution. A. earphones B. earrings C. earplugs D. ear drops 5. What is the main …………… of visual pollution? - Because there are too many advertising billboards. A. effect B. affect C. result D. cause 6. By 1970, Canada …………… to choose the maple tree with the leaves as its national icon. A. decided B. has decided C. had decided D. have decided 7. If an earthquake suddenly …………… now, what …………… you do? A. would occur - would B. occurred - would C. will occur - will D. occurs - will 8. The victims of the wildfire …………… to the hospital already. A. has been taken B. have been taken C. has taken D. have taken 9. If the factory …………… dumping poison into the lake, all the fish and other aquatic animals …………… A. continued - will die B. continues - will die C. continues - die D. continued – died giúp mik với hứa sẽ vote 5 starr