The rule is that the action which occurs first takes the Past Perfect tense ('had' + V3). Since the sun rose first, 'had risen' is correct. The plowing happened after, so it should be in the Past Indefinite tense ('plowed'), not 'had plowed'.

The action started in the past and is still ongoing, requiring the Present Perfect Continuous ('has been working'). 'The beginning of the semester' is a specific point in time, which requires the use of 'since'.

The Future Continuous tense ('will be studying') is used to describe an action that will be in progress over a period of time in the future (between 7 PM and 9 PM).

When two actions happened in the past, the one that happened earlier is put in the Past Perfect ('had burned'). The action that happened later is in the Past Indefinite ('arrived'). The warehouse burned down before the brigade arrived.

The preposition 'for' is used to denote a duration or period of time (e.g., five years). 'Since' is used to denote a specific starting point in time (e.g., since 2018). 'Since more than' is incorrect; it should be 'for more than'.

The correct structure for the Future Continuous tense is 'will be + verb-ing'. Therefore, 'will be fly' is grammatically incorrect and should be 'will be flying'.

The mistake happened first, so it requires the Past Perfect ('had made'). The realization and the sending of the email happened afterward (and simultaneously), so they both take the Past Indefinite tense ('realized', 'sent').

The preposition 'since' is used for a specific point in time (like the year 1947). The preposition 'for' is used for a duration of time (like 'for 75 years'). The use of 'for' with a specific year is incorrect.

The Future Continuous tense ('will be writing') is specifically used to indicate an ongoing action at a particular moment in the future. The other options describe the start of an action (A), a completed action (C), or a state (D).

The phrase 'for the last hour' indicates a duration of time that started in the past and continues up to the present moment. This requires the Present Perfect Continuous tense ('have been trying').

The preposition 'for' is used to denote a period of time (e.g., two quarters, three years). 'Since' is used to denote a specific point in time (e.g., last January, 2022). The correct phrase would be 'for the last two quarters'.

When two actions occur in the past, the action that happened first is expressed in the Past Perfect tense ('had emailed'). The action that happened second is expressed in the Past Indefinite tense ('left').

The Future Continuous tense ('will be + -ing') is used to describe an action that will be in progress at a specific time in the future ('This time next Monday').

The Present Perfect Continuous is not used with stative verbs like 'own', 'know', 'love', etc. For duration with stative verbs, the Present Perfect Simple ('have owned') is used.

The action of cooking happened before the guests arrived. Therefore, it must be in the Past Perfect tense. The correct phrase is 'we had already cooked'.

The Future Continuous tense ('will be snowing') is used to describe an ongoing action at a specific point in the future ('at this time tomorrow').

The action started in the past and continues to the present moment, requiring the Present Perfect Continuous ('has been waiting'). 'His entire life' is a period of time, so 'for' is the correct preposition.

The doctor's action of prescribing the medication happened first, so it requires the Past Perfect ('had prescribed'). The patient's feeling of improvement happened afterward, requiring the Past Indefinite ('felt').

The structure of the Future Continuous tense is 'will be + present participle (-ing form)'. The correct form is 'will be attending'.