1.What were you doing when I (ring)................. you last night? 2.Mrs Lan askes me (come)....................... back early the following day. 3.I (wait)..................... for two hours, but she (not come)..................... yet. 4.The Sun (set)............................ in the West. 5.They (not speak).............................. to each other since they quarreled. 6.She has bought.............sugar. A.some. B.a. C.any. D.anything