Scientists are trying to find(alter)............... energy soirces

natural resources will be run out soon if we use them (economy)

Part 1: Commplete each blank with one given word. There are more words than needed. (1,5 m)
for who    Therefor   which after  Although carefully wearing  so
1. We must prepare our lesson ......... before going to school.
2. I always look .........my younger sister when my parents are at work.
3. Mr. Manh saved a baby ....fell from the 12th floor.
4. I suggest................fell from the 12th floor.
5...............she is not very rich, she always helps the poor.
6. Lan always studies hard..............,she gets good marks at school.

the company is investing much money in modernizingland (industry).............. the factories

if all pollution goes on,the field(litter).................. with plastic and tins

some designers(add).................. these patternto the ao daifore ages