【C10】A．asB．ifC．becauseD．while

【C19】A．asB．ifC．becauseD．while

【C12】A．AsB．As ifC．ThoughD．Unless

Animals think much ____ building their houses.A: asB: duringC: whileD: because

（) you are very busy, I shall do the job myself.A. asB. sinceC. whileD. because

【C10】A．AsB．WhichC．ThatD．Who

【C10】A．asB．soC．orD．but