251. I already ……….. (ask) you three times for a glass of water. 252. He ………. (leave) as soon as he ……… (hear) the news last night. 253. I opened the door just as my boy-friend Tom ……….. (ring) the bell. 254. We ……….. (not see) Mr. and Mrs. Baker for a long time. 255. It will soon be fifteen years since we …….. (come) to live in Ho Chi Minh city. 256. Until she spoke I ……… (not realize) she ……… (be) foreign. 257. Don’t leave till I ………. (arrive). 258. When your father ……… (die)? ~ I ………. (not know) when he ……… (die). 259. It …….. (rain) when we arrived. 260. Dick ………..(start) school before he ………. (be) seven.