11.
A 2) took 3) sat 4) left 5) hadn't caught
B 1) was 2) had forgotten 3) got 4) was (мне кажется, что здесь по смыслу не очень подходит паст перфект, хотя по конструкции должен быть именно он, т.е. had been, в общем не знаю честно говоря...)
C 1) had 2) got up 3) had finished 4) had
D 1) went 2) had 3) got 4) realised 5) had forgotten 6) went
12.
2) had had 3) had eaten 4) had been only driving 5) had left 6) had locked 7) had tried 8) had he called