$\text{1.}$ had left - arrived
$\text{2.}$ wondered - would left
$\text{3.}$ didn't leave - had finished
$\text{4.}$ had entered - began
$\text{5.}$ asked - didn't do
$\text{6.}$ had already sent - realized - sent
$\text{7.}$ had gone - had
$\text{8.}$ was - expectd
$\text{9.}$ had they sold - regreted
$\text{10.}$ didn't eat - had come
$\text{11.}$ told - had never met
$\text{12.}$ did - had gone
$\text{13.}$ had begun - left
$\text{14.}$ had been - started
$\text{15.}$ left - had bought - needed
$\text{16.}$ had burnt - arrived
$\text{17.}$ did - was
$\text{18.}$ had already heard - told
$\text{19.}$ had lived - came
$\text{20.}$ didn't talk - arrived - had already left
