1.A
2.A
3.mistakes
4.frustrated
5.to read
6.sadly
7.safety
8.sending
1.The ice isn't _thick_enough_for us to skate on.
2.A coat_costed_ her_two hundred dollars.
3.The boy's sister_has_been_in the army _for_two years.
1.likes---liked
2.were happended---happened
3.heard--received
或者heard from his father
5.well---much