Ms Word

Step 1: Understanding the key function in MS Word.
In MS Word, the F7 key is used to check spelling and grammar in a document.

Step 2: Analyzing the options.
- (A) F6: This is used to toggle between panes in MS Word, not for checking spelling and grammar.
- (B) F3: This is used to change case in MS Word, not for checking spelling and grammar.
- (C) F8: This is used to extend the selection in MS Word, not for spelling and grammar.
- (D) F7: This is the correct answer, as F7 opens the spelling and grammar check in MS Word.

Step 3: Conclusion.
The correct answer is (D) F7.

Step 1: Understanding the shortcut key for a new document.
The shortcut key to open a new blank document in MS-Word is CTRL + N.

Step 2: Analyzing the options.
- (A) CTRL + B: This shortcut is used to bold text in MS-Word, not to open a new document.
- (B) CTRL + N: This is the correct answer. CTRL + N opens a new blank document in MS-Word.
- (C) CTRL + V: This shortcut is used to paste text, not to open a new document.
- (D) CTRL + M: This is used for indenting text, not for opening a new document.

Step 3: Conclusion.
The correct answer is (B) CTRL + N.