………….. is engaged in a struggle for survival
A. Every living creature B. All living creatures
C. Living every creature D. Every alive creature
4. ………….. in many kinds of minerals.
A. Canada is richness B. Rich is Canada
C. Canada is rich D. Canada has rich
5. Man has used rivers as a means of transporting goods ……….thousands of years.
A. since B. at
C. for D. in