Help with particles


I've been given the following sentences, and I'm supposed to fill in the
blankets with particles.

  1. Katō-san wa getsu-yōbi ( ) ka-yōbi ( ) Nihon ( ) kaerimasu.
  2. Atama ga itai desu ( ) netsu ( ) arimasu ( ) kaze da ( ) omoimasu.

Here are my attempts:

  1. Katō-san wa getsu-yōbi **mo** ka-yōbi **ga** Nihon **ni** kaerimasu.
  2. Atama ga itai desu **o** netsu **o** arimasu **ga** kaze da **o** omoimasu. 

What particles should I use?




> **Question 1: Katō san wa getsu-yōbi (１) ka-yōbi (２) Nihon (３) kaerimasu.**  
>  Your answer: Katō san wa getsu-yōbi (も) ka-yōbi (が) Nihon (に) kaerimasu.  
>  My answer: Katō san wa getsu-yōbi (か) ka-yōbi (に) Nihon (へ) kaerimasu.

  * に in (3) also makes sense, so your answer is correct. 
  * You can't depart to Japan at the same time on Monday and also on Tuesday, so (1) couldn't be も. 
  * As for (2), if you use が there, then the phrase becomes like "ka-yobi is going to return to Japan". It's not ka-yobi but Katō-san that is going to return to Japan. 

> **Question 2: Atama ga itai desu (４) netsu (５) arimasu (６) kaze da (７)
> omoimasu.**  
>  Your answer: Atama ga itai desu (を) netsu (を) arimasu ( ~~が~~ か) kaze da (
> ~~を~~ と) omoimasu.  
>  My answer: Atama ga itai desu (＊) netsu (＊) arimasu (＊＊) kaze da (と)
> omoimasu.

I suggest you first think of a logical English translation for your answer
_Atama ga itai desu (を) netsu (を) arimasu (が) kaze da (を) omoimasu_ by
consulting the following hints:

  * Atama ga itai desu ([4]{L}) = I have a headache [and]{LLL} 

  * netsu (5) arimasu ([ 6 ]{LLL}) = I have a fever, and [therefore]{LLLLLLLLL} 

  * kaze [da(7)]{LLLLL} omoimasu. = I guess/think [that]{LLLL} I have a cold. 




> **Question 1: Katō san wa getsu-yōbi (１) ka-yōbi (２) Nihon (３) kaerimasu.**  
>  Your answer: Katō san wa getsu-yōbi (も) ka-yōbi (が) Nihon (に) kaerimasu.  
>  My answer: Katō san wa getsu-yōbi (か) ka-yōbi (に) Nihon (へ) kaerimasu.

  * に in (3) also makes sense, so your answer is correct. 
  * You can't depart to Japan at the same time on Monday and also on Tuesday, so (1) couldn't be も. 
  * As for (2), if you use が there, then the phrase becomes like "ka-yobi is going to return to Japan". It's not ka-yobi but Katō-san that is going to return to Japan. 

> **Question 2: Atama ga itai desu (４) netsu (５) arimasu (６) kaze da (７)
> omoimasu.**  
>  Your answer: Atama ga itai desu (を) netsu (を) arimasu ( ~~が~~ か) kaze da (
> ~~を~~ と) omoimasu.  
>  My answer: Atama ga itai desu (＊) netsu (＊) arimasu (＊＊) kaze da (と)
> omoimasu.

I suggest you first think of a logical English translation for your answer
_Atama ga itai desu (を) netsu (を) arimasu (が) kaze da (を) omoimasu_ by
consulting the following hints:

  * Atama ga itai desu ([4]{L}) = I have a headache [and]{LLL} 

  * netsu (5) arimasu ([ 6 ]{LLL}) = I have a fever, and [therefore]{LLLLLLLLL} 

  * kaze [da(7)]{LLLLL} omoimasu. = I guess/think [that]{LLLL} I have a cold. 

