1．Before you climb up the ladder, make sure that it is (稳固的)．
答案：stable
2．His income is not enough to meet the (开销) of his family.
答案：expense
3．I know little of the players so my choice of them for the team will be (随意的)．
答案：arbitrary
4．A doctor shouldn’t give away (秘密的) information about patients.
答案：confidential
5．The organization is planning to (赞助) many charity activities for the poor.
答案：sponsor
