A: There is any rules or trick to identify this verb? For examlpe sentences below, The answers I choose are the one in BOLD.
1. Business contacts and financial backing (is, are) all that I need to establish my career as a dress designer.
2. One head of lettuce in most of the stores in our area now (costs, cost) almost a dollar.
B: Can you give me an example of the THESIS STATEMENT with this sentences