Chọn đáp án đúng và giải thích vì sao lại chọn đáp án đó

Chọn đáp án đúng và giải thích vì sao lại chọn đáp án đó..
1. Most reptiles have three chambers in their heats,.......some do have four.
A.in spite B.although C.despite D.so long  as
2 Mammals,.....are warm-blooded, meaning that they generate their own body heat and are thus more tolerant of temperature extremes.
A.On thế other hand B. In contrast C. In short
D. In conclusion
3. Birds and mammals, .....they are warm- blooded, move more swiftly and have greter physical endurance than reptiles.
A.  although B.thus C.because D.besides
4. We should set our printer's default....ít prints on both sides of the page.
A.besides B.and C.so D.therefore
5. Your comper may go to sleep,....it's still consuming energy.
A.but B.even though C.so D.furthermore