Would appreciate some help.

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

Match each poem to its form either free verse or blank verse

Identify the following sentence as simple, compound, complex, or compound-complex. its capital, maputo, is the city where the port is located; it is linked by rail with south africa, swaziland, and zimbabwe. a. compound b. complex c. simple d. compound-complex