supply the correct form or tense of the words.

1. they frequently (mobile) ________ the traffic as they march through the streets.

2. if you behave with this sort of (polite) ________ to your other customers, i don't think you will remain in business long.

3. young children should be well aware of their (behave) _________ manners.

4. don't be no nervous. (loose) ______ up a little.

P/s: làm và gt giúp e ạ

preposition.

1. when i was looking through my papers, i came _______ this picture.

2. people often look back ______ their childhood as a happy.

P/s: làm và gt hộ e ạ