1.efforts were made to ... train track width across Europe in the late twentieth century a.standard c.standardization b.standards

1.efforts were made to ... train track width across Europe in the late twentieth century
a.standard c.standardization
b.standards d.standardize

2.Visitors to this part of the facilities must show proper ...
a.identity c.identification
b.identify d.identifying
3.The program seems easy to use,but the interface needs to be...
a.simplified c.simplest
b.simply d.simplification
4.To enter information on the spreadsheet you will ... a cell by clicking on it and then type your data.
a.select c.to select
b.selecting d.selection