Although in reality there is variation concerning the absence or presence of commas in defining or non-defining relative clauses, careful English requires specific punctuation conventions to be respected. Decide in each of the following pairs which sentence is more likely to have a non-restrictive reading, and add the necessary punctuation.

1. (a) Armand Williams whose career as an actor spanned more than 50 years died yesterday.

(b) The customer whose luggage was lost in Milan would like to lodge a formal complaint.

2. (a) The annual budget which the committee initially proposed has been significantly altered.

(b) The proposed budget which is untenable in the long term will surely be voted down.

3. (a) Delegates who have not yet reserved a hotel room are urged to do so as soon as possible.

(b) Ms. Crims who has not been to a single meeting has been asked to resign by the end of the year.