Grammar

26. Peter and Tom plays tennis every afternoon with Mary and me.

                                  A       B                    C                        D

In this sentences, the verb plays in answer A is incorrect because the sentences is Simple Present Tense. The subject in this sentence isi Peter and Tom, in Simple Present Tense the Verb plays used for the subject He, She or It. So, the correct verb is play not plays.

Simple present tense = S + V(s/es) + O/Adv

 

32. Please give me a few coffee and some donuts if you have any left.

                      A         B                               C                        D

In this sentences, the verb a few in answer B is incorrect because a few are used with nouns that can be counted (countable) to show a small quantity. Supposedly if want to show that nouns can not be counted (uncountable) to indicate the amount of use a little bit.