Convertir des phrases en français du passif à l'actif, choisir des mots manquants, et corriger des expressions idiomatiques.

Here are the solutions for the French grammar questions:

21. J'aimerais vivre jusqu'à ______ ans.

• The number eighty in French is "quatre-vingts". The word "vingt" takes an 's' when it is multiplied by a number and is the last number in the expression.

• The standard spelling includes hyphens.

• The correct option is C.

• C) quatre-vingts

22. Le réseau téléphonique est mauvais ______ les téléchargements sont lents.

• This sentence requires a conjunction that expresses a consequence or result.

• "Le réseau téléphonique est mauvais" (The phone network is bad) is the cause, and "les téléchargements sont lents" (downloads are slow) is the effect.

• "Donc" means "therefore" or "so", indicating a consequence.

• The correct option is D.

• D) donc

23. Mon grand frère a ______ amis dans l'enseignement.

• The expression "beaucoup de" means "a lot of".

• When followed by a noun starting with a vowel or a silent 'h', "de" contracts to "d'".

• "Amis" starts with the vowel 'a', so it should be "beaucoup d'amis".

• The correct option is B.

• B) beaucoup d'

24. « Le coup de fil a été reçu par Sam ». À la voix active cette phrase devient :

• The original sentence is in the passive voice: "Le coup de fil a été reçu par Sam" (The phone call has been received by Sam).

• To convert to the active voice, the agent ("Sam") becomes the subject, and the subject of the passive voice ("Le coup de fil") becomes the direct object.

• The tense must remain the same. The passive sentence uses the passé composé ("a été reçu"). The active verb should also be in the passé composé.

• The passé composé of "recevoir" for "Sam" (il) is "a reçu".

• The correct active sentence is "Sam a reçu le coup de fil."

• The correct option is A.

• A) Sam a reçu le coup de fil.

25. J'ai raté mon vol ______ embouteillage en ville.

• This sentence requires a phrase that indicates the cause for missing the flight. "Embouteillage" (traffic jam) is a negative cause.

• "En raison de" means "because of" or "due to" and is used to express a cause.

• "Embouteillage" is a masculine singular noun, so it would be "en raison de l'embouteillage". The option "en raison de" provides the correct structure.

• The correct option is D.

• D) en raison de

26. Je fais la lessive en______.

• This sentence uses the construction "en + present participle" (the gerund) to indicate an simultaneous action ("I do the laundry while singing").

• The verb is "chanter" (to sing).

• The present participle of "chanter" is "chantant".

• The correct option is C.

• C) chantant