Text 1
21.[C] received acclaim.
22.[B] modest.
23.[D] overestimate the value of live performances.
24.[B] They are easily accessible to the general public.
25.[A] doubtful.

Text 2
26.[B] frank.
27.[C] their strained relations with the boards.
28.[C] hunted for.
29.[B]loyalty of top performers is getting out-dated.
30.[A]CEOs: Where to Go?

Text3
31.[C] eager to help their friends promote quality products.
32.[C] strong user traffic.
33.[B] can be used to produce negative effects in marketing.
34.[A] responding effectively to hijacked media.
35.[A] Alternatives to conventional paid media.

Text 4  
36.[D]lasting reward
37[A]celebrity moms are a permanent source for gossip.
38.[D] are less likely to be satisfied with their life.
39[A]soothing
40.[D]We sometimes neglect the happiness from child rearing