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