Fixed Ebazhanov#3832 (Ebazhanov#3835)

* Fixed variable names in Q9 for OOP quiz

* Fixed dictation and correct answer of Q34 of OOP

Inside the body of a static constructor, only static members of a class are accessible.

* Fixed Q35 of OOP quiz dictation

* Update object-oriented-programming-quiz.md

* Update object-oriented-programming-quiz.md

* Updated Q62 of OOP quiz

The choices are a copy of Q61 and are thoroughly irrelevant to Q62

* Fixed dictation of a choice in Q65 of OOP quiz

* Added two new questions (Q66, Q67) for OOP Quiz

* Added reference for Q66 of OOP quiz

* Fixed Ebazhanov#3832

dotnet-framework/dotnet-framework-quiz.md

@@ -526,3 +526,10 @@
 - [ ] JIT is used for deployment, versioning, and security, and forces the computer's processor to execute the native machine code.
 
 Reference: [Compilation by the JIT compiler](https://docs.microsoft.com/en-us/dotnet/standard/managed-execution-process#compilation-by-the-jit-compiler)
+
+#### Q70. Which statement about a constant variable is not *true*?
+
+- [x] At run time, its value is evaluated.
+- [ ] It cannot be static.
+- [ ] Only at declaration can it be initialized.
+- [ ] At compile time, the value is evaluated.