Fill in the blanks with the correct verb forms and relative pronouns.

Here are the solutions to the remaining questions:

31) Maria _______ out of the country for quite a long time now.
The phrase "for quite a long time now" indicates an action that started in the past and continues to the present. This requires the present perfect tense.
The correct option is A. Has been.

32) The radio has _______ working.
The auxiliary verb "has" requires a past participle to form a perfect tense or to indicate a state. In this context, it means the radio ceased to work.
The correct option is D. Stopped.

33) The children _______ out to play after it had stopped raining.
The phrase "after it had stopped raining" indicates a past action. Therefore, the main verb describing the children's action should also be in the simple past tense.
The correct option is A. Went.

34) This is the house _______ Jack built.
This sentence requires a relative pronoun to refer to "the house" (a thing) and act as the object of the verb "built".
The correct option is B. Which.

35) There goes Mrs. Jordan, _______ husband died last week.
This sentence requires a possessive relative pronoun to show that the husband belongs to Mrs. Jordan.
The correct option is C. Whose.