1.Don't-------afraid------ask for help if you need it -Thank

1.Don't_______afraid______ask for help if you need it _Thanks a lot
A、be；to B、be;of.C,/,to
2.-Have you been to Taipei?
-Yes,I _______three ten years ago.
A.live.B.have been.C.lived
3.-Do you think ______she's going to agree_____our suggestion or not?
A.Whether,on.B,if,with.C,both A and B
请问为什么选正确选项?
1选A，2选C 3选A