I didn't think his comments were very (appropriate) at the time.
Correct
Right
Exact
Suitable
This is the (instance) where big, obvious non-verbal signals are appropriate.
Situation
Attention
Place
Matter
When you are in a restaurant, you can raise your hand slightly to show that you need (assistance).
Bill
Menu
Help
Food
When you see your teacher (approaching) you, a slight wave to attract his attention is appropriate.
Coming nearer to
Catching sight of
Pointing at
Looking up to
It is (impolite) not to say "Thank you" when you are given something.
Slight
Rude
Informal
Formal
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