18. haven't seen
19, got
20, will leave / knows
21, was playing / arrived
22, comes / sees
23, will come / Are you
24, will come
25, will you spend
26, blooms
27, haven't been living
28, will never forget / have just told
29, are preparing
30, stayed / rode / had borrowed
31, told / had visited
32, has worked
33, worked
34, build / fly
35, have lost / Can you help
36, haven't smoked
37, arrived / has just gone
38, have ... been
39, Have you received
40, joined / was
41, Do you remember / forgot
42, have studied
43, wrote
44, left / haven't heard
45, Did you speak
46, haven't seen
47, can't / saw
48, were playing