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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!

1.あなただけではこの映画を見てはいけません。あなたは16歳です!
-Anata dakede wa kono eiga o mite wa ikemasen. Anata wa 16-saidesu!

2.私は日本でアルバイトの時間を仕事にさせて頂きます。
-Watashi wa Nippon de arubaito no jikan o shigoto ni sa sete itadakimasu

3.メアリーとスーは、会って、時間ほど話した。
-Mearī to sū wa, atte, jikan hodo hanashita.

4.テストは難しいことではありませんでした。 (それがいた)私はたくさんの事を研究していたためです。
-Tesuto wa muzukashii kotode wa arimasendeshita. (Sore ga ita) watashi wa takusan no koto o kenkyū shite ita tamedesu.

5.私は母を助けた。彼女がビジー状態であったため(これは、です)。
-Watashi wa haha o tasuketa. Kanojo ga bijī jōtaideatta tame (kore wa,desu).

here you go hope this helps!

1. You must not watch this movie alone. You are 16 years old!=
Noh ponoh fow u, u tu yong

2. I am allowed to work part-time in Japan=
Ai gut de greencaard

3. Mary and Suu met and talked for about an hour.=
Bee chess takalot

4. The test was not difficult. (That was) because I had studied a lot.=
Mai tichers dotter ismai tutorr

5. I helped my mother. (It's) because she was busy.=
Ai wonte tu pleide wii

>What's up with the half-way translations? You have to insert breaks by pressing Enter if you want to show full sentence when typing Japanese here. BTW, both of those 2 answers are by Google or something, and does not work at all as Japanese.

1.あなた一人でこの映画を見てはいけません。あなたはまだ16歳です!
-Anata hitori de kono eiga o mite wa ikemasen. Anata wa mada 16-saidesu!

2.私は日本でバイトをしていいのです。
-Watashi wa nihon de baito wo shite iino desu.

3.マリーとスウが会って一時間ほど話した。
-Marii to suu ga atte ichi jikan hodo hanashita.

4.テストは難くありませんでした。 (それは)私がたくさん勉強したからです。
-Tesuto wa muzukashiku arimasendeshita. (Sore wa) watashi ga takusan benkyou shita kara desu.

5.私はお母さんを手伝いました。(それは)お母さんが忙しかったからです。
-Watashi wa okaasan wo tetsudaimashita. (sorewa) okaasan ga isogashi katta kara desu.

by the way, Rae's answer looks like Rae used google translate, not a good site X(