12. I am looking forward to ............ my birthday party next week.

Answer: D

Explanation:

I am looking forward to having my birthday party next week.

The sentence correctly uses "having" to indicate anticipation for the event in question. The phrase "looking forward to" is typically followed by a gerund, which makes "having" the appropriate choice.

A) Going

While "going" is a gerund and could fit in some contexts, it does not appropriately convey the anticipation of the event as "having" does. "Going" suggests movement rather than the celebration itself, making it less suitable in this context.

B) Go

The option "go" is an infinitive form, which does not align with the structure required after "looking forward to." This phrase necessitates a gerund, rendering "go" incorrect in this instance.

C) Have

"Have" is also in the infinitive form, similar to "go," and is thus not suitable for the context of expressing anticipation. The proper structure requires a gerund, which excludes "have" from being a valid choice.

D) Having

This is the correct answer as "having" is a gerund that fits perfectly with "looking forward to." It conveys the idea of anticipating the birthday party, making it the most suitable option.

Conclusion

The correct answer, "having," aligns with the grammatical structure required by "looking forward to," which must be followed by a gerund. Options A, B, and C fail to meet this requirement, either by using incorrect forms or by not conveying the intended meaning of anticipation. Thus, "having" is definitively the right choice.