1.
| She broke the vase while she ____ (had put/was putting) it on the table.
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2.
| Mr. Todd ____ (was teaching/had been teaching) for thirty years when he retired.
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3.
| I phoned Roy because I ____ (wanted/had wanted) to inform him about the accident.
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4.
| They ____ (had walked/had been walking) for hours when they stopped for a rest.
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5.
| The shop ____ (had been selling/had sold) the dress by the time I got there.
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6.
| Joe was happy. He ____ (was getting/had got) the certificate.
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7.
| It ____ (was raining/had rained) while they were playing the football match.
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8.
| Rob ____ (was opening/opened) the box and looked inside.
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9.
| Cathy was glad to hear that she ____ (was getting/had got) the job.
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10.
| People ____ (used to work/were working) a lot in those days.
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11.
| I was skating when I ____ (slipped/was slipping) on the ice.
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12.
| They ____ (were already buying/had already bought) the tickets when they went to the cinema.
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13.
| Megan ____ (had broken/was breaking) her leg, so she couldn't run for months.
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14.
| We ____ (had been staying/stayed) by the sea last summer.
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15.
| Elvis Presley ____ (sang/had sung) lots of hit songs.
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16.
| I ____ (opened/was opening) the window and called her.
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17.
| They ____ (had stood/were standing) inside when the rain started.
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18.
| Alexander Graham Bell ____ (had invented/invented) the telephone.
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