Question

Olá, estou com dúvidas em uma questão de inglês relacionada ao futuro perfeito: 
Choose the best verb form to complete the sentences:

1. Do your best on your exam. Here, I ___________ for your success.
a) will be praying
b) will have prayed
 
2. By this time tomorrow, we_______ lunch with our family members.
a) will have
b) will have had
 
3. She hopes I _______ the cookies by the time she arrives so I can help her with the cake.
a) will be baking
b) will have baked
 
4. Don't even try to get in touch with me on my vacation. I ______ in Europe.
a)will be traveling
b)will have traveled
 
5. teacher, we promise we________ all your expectations by the end  of the semester.
a) will be meeting
b) will have met
 
6. Hurry up!if not, the plane ______ by the time you get to the airport.
a)will be leaving
b) will have left
 
7. By this time next Monday, Dan ______ happily wih his new co-workers.
a)will be talking
b)will talk
 
caso alguém possa me ajudar com uma explicaçãozinha agradeço muito. Bem, já fico extremamente agradecida pela ajuda, preciso entregar estas questões.
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Answer 1

1) will be praying
2) will have
3) will have baked
4)will be traveling
5)will have met
6)will bw leaving
7)will bw talking