Answer:
We meet every Thursday, at a different club member's house each week. The host for each week provides drinks and a number of snacks.
Step-by-step explanation:
In the given sentence, the word(s) to be put in the blank is determined by the subject-verb agreement. This means that the subject and the verb must correspond with each other, added with the objects.
Here, the object is "drinks and a ..... snacks" which on first glance are plural. But the use of "a" before the "snacks" make it contradictory, meaning "a" is used for singular things while the "snacks" is plural at the same time. So, the best word(s) or phrase to use is "a number of" which signals a plural case.
Thus, the final sentence becomes
We meet every Thursday, at a different club member's house each week. The host for each week provides drinks and a number of snacks.