Maybe I’m not very healthy, ___ I have healthy habits.   

A. although      B. because     C. and      D. so

—_______he is very old, he works very hard.

  — Wow, great. I should learn from him.

A. Although   B. However     C. Because    D. So

________ he got up early, _______ he still missed the early bus.

       A. Although, but  B. Because, so  C. Although, /  D. Because, /

_____ it was very cold, _____ my friend still went swimming in Jialing River this morning.

A. Although; but    B. Although;/   C. But; although   D. /;although

____ it was late, the students were still studying in the classroom.

A. Although           B. But              C.As long as             D. Because of