1．(2019·陕西西安一中月考)I'm very cautious(caution) about expressing my opinions in public in case I may make mistakes.
2．She's too protective towards her children; she should let them be more independent (independence).
3．It is clear that the Spring Festival Gala on CCTV can hardly cater to the tastes of all age groups.
4．He expressed his approval (approve) of the suggestion that the school be established immediately.
