1. ________ we gave him something to eat, he would save it up for his little sister.
A. Whatever B. However
C. Whenever D. Whichever
2. Hard-working though he was, ________ there was never enough money to pay the bills.
A. / B. and
C. but D. therefore
3. Much hard ________ he tried，he flailed to catch up with the first runner.
A. although B. as
C. while D. when
4. I got in touch with Charles ________ I received his letter.
A. when immediately B. soon
C. immediately D. suddenly
5. We were just ________ calling you up ________ you came in.
A. about; when B. on the point of; while
C. on the point of; when D. on the point of; as
6. Most of his great novels and plays were not published or known to the public ________ his tragic (悲剧) death in 1786.
A. even before B. ever since
C. until after D. until before