In text I,

"also" (l.4) can be correctly replaced by too.

In text I,

"those" (l.6) refers to "chips" (l.5).

In text I,

"costs" (l.16) is a singular form.

In text I,

"better" (l.20) is the opposite of worst.

In text I,

"whether" (L.8) cannot be replaced by if.

Text I – questions 18 and 19

From text I, it can be concluded that

Network Diagnostics is a tool that solves network-related problems with your computer.

Text I – questions 18 and 19

From text I, it can be concluded that

certain scanning choices can detect only one type of problem.

In the text above, the fragment "usually to prevent unauthorized access" (L.2-3) is the same as

seldom to prevent unexpected access.

In the text above, the fragment "usually to prevent unauthorized access" (L.2-3) is the same as

most often to avoid unauthorized ingress.

In the text above, the fragment "usually to prevent unauthorized access" (L.2-3) is the same as

occasionally to preclude unauthorized ingress.