おはよう! Good morning!

Answer: 3 チョコレート

Line 3 says はい、チョコレート (Here, some chocolate). Mr. Tanaka gives Lin chocolate in the afternoon.

Answer: 2 こんばんは

Line 6 ends with こんばんは! It was evening, but Mr. Tanaka said おはよう, so Lin answered with the evening greeting こんばんは.

Answer: 2 おはよう

The morning greeting is おはよう, and Lin answers おはよう too. こんばんは is for the evening, おやすみなさい is said before going to bed, and さようなら is said when parting.

Answer: 3 konbanwa

こんばんは is read konbanwa. The final は is pronounced wa in this greeting. The same is true for こんにちは.

Answer: 1 こんばんは

The evening greeting is こんばんは, so you answer こんばんは back. こんにちは is for the daytime and おはよう is for the morning. ありがとう (thank you) is not a reply to a greeting.

Answer: 4 ありがとう

When you receive something, you say ありがとう (thank you). ごめんなさい is used to apologize.

Answer: 2 ごめんなさい

The speaker mistakenly said おはよう at night, so the apology ごめんなさい (I'm sorry) fits here.

Answer: 1 ありがとう

a is あ, ri is り, ga is が, and tō is とう, so arigatō is ありがとう (thank you). か is ka, ど is do, and い is i.

Answer: 3 すみません

To get a staff member's attention, you say すみません (excuse me): "Excuse me, the menu..." The other words do not fit here.

Answer: 4 おやすみなさい

Before going to bed at night, you say おやすみなさい (good night). おはよう is said when you get up in the morning.