Warn against غلطی پر خبردار کرنا

The doctor warns against smoking. 

1. In
2. On
3. Of
4. None of these

1. Preposition phrase
2. Noun phrase
3. Adjective phrase
4. None of these

1. In
2. At
3. On
4. Into

1. Than
2. To
3. Then
4. All of these

1. With
2. To
3. For
4. About