Chứng minh rằng 81^7-27^9-9^13 chia hết cho 45

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Bài 1 : Put the verbs in brackets into the past simple or the present perfect 1 A : .......................( you/ever/meet) anyone famouse ? B : Yes , last summer I ......................( sit) next to Brad Pit on a plane to LA . 2 A: How long ago ...............( you/start ) painting ? B : Ten years ago . I .................( recently / complete ) a painting that the National Gallery ............( ask ) me to do a year ago . 3 A: Last night , I .................( see) the latest James Bond film . B : Oh n, I ................( already /see) it twice . 4 A: Do you know that Mrs Janet ...............( work ) here for sixteen years ? B : I thought she ...................( start ) working here ten years ago . Bài 2 : put the verbs in brackets into the correct verb form . 1 I (have) .............. dinner when his friend called . 2 Joan ( travel ) ................... around the world 3 We ( not begin ) ................. to study for the test yet 4 Do not get on a bus while it ( run ) ................ 5 I ( invite ) ................them to my birthday party yesterday , however , they ( not come ) ................ 6 Look ! Somebody ( clean ) ............the room 7 My brother ( begin ) ...................looking for a job in January 8 Timson ( make ) ............... 13 films and I think her latest is the best 9 She ( cook) ................... at the moment . That has why she ca not answer the phone 10 She does not mind ( go ) ........... out in the evening 11 I ( not see ) .............him since we ( leave ) .............school 12 Football ( be ) ........... my favourite sport . I like ( play ) .............it in my free time 13 Jane ( leave ) ........... just a few minutes ago 14 She ( be ) ........... extremely quiet since her husband died