1. Although they live far (away) from their country, they celebrate Tet holiday with plenty of traditional foods. 

2. If we go on wasting water, there will be a great shortage of fresh water in a few decades.

3. We are pleased that you are working hard for the coming exam.

4. Hoang has had a sore leg because he fell over while playing football.

5. He suggested using gas instead of burning coal for cooking.

1. Although/ they/ live/ far/ country/ celebrate/ Tet/ holiday/ plenty/ traditional foods.

=>1. Although they live far away from their country, they celebrate Tet holiday with plenty of traditional foods. 

2. If/ we/ go on/ waste/ water/ there/ be/ great shortage/ freshwater/ few decades.

=>2. If we go on wasting water, there will be a great shortage of fresh water in a few decades.

3. We/ pleased/ that/ you/ work hard/ coming exam.

=>3. We are pleased that you are working hard for the coming exam.

4. Hoang/ have/ sore leg/ because / fell over/ while/ play football.

=>4. Hoang has had a sore leg because he fell over while playing football.

5. He/ suggest/ use/ gas/ instead/ burn/ coal/ for/ cook.

=>5. He suggested using gas instead of burning coal for cooking.