46. What was the name of that TV series __ last week? a) who we saw b) that we did see c) that we saw d) which we did see 47. Don't forget __ a) turn it off b) to turn off it c) to turn it off d) turning it off 48. My mother __ nagging me when I was young. a) used to b) was always c) would d) would always

46. The correct answer is c) that we saw. In this sentence, the relative pronoun "that" is used to introduce a defining clause, which provides essential information about the TV series. The verb "saw" is in the simple past tense, which is appropriate for referring to an event that occurred last week.<br /><br />47. The correct answer is c) to turn it off. In this sentence, the infinitive verb phrase "to turn it off" is used as the direct object of the verb "forget." The infinitive form is used to express the purpose or intention of the action.<br /><br />48. The correct answer is a) used to. In this sentence, the phrase "used to" is used to indicate a habitual action in the past. The verb "nagging" is in the simple past tense, which is appropriate for referring to an action that occurred regularly in the past.