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Translate these sentences into Japanese?

I was having some problems translating the following sentences into Japanese:

1. You must not watch this movie alone. You are 16 years old!
- Kono eiga o hitoride mitehaikemasen. Anata wa juurokusai desu.

2. I am allowed to work part-time in Japan.
- Nihon de arubaito wa yurushitemoiidesu.

3. Mary and Suu met and talked for about an hour.
- Meari wa Suu to atte, ichijikan-guurai ni hanashimasu

4. The test was not difficult. (That was) because I had studied a lot.
- Tesuto o muzukashikuarimasen deshita. Watashi wa takusan benkyoushimasu kara.
(Is the test main topic here, hence wa?. I also realize takusan is a description for unit, so it's probably wrong.)

5. I helped my mother. (It's) because she was busy.
- Okasan o tetsudaimashita. Isogashii desu kara.

Corrections and suggestions would be appreciated!

4 Answers4