Answer:
1- brindis
2- gritaron
3- ¡felicidades!
4- pastel
5- velas
6- recordar
7- regalos
8- gritar
9- lo pasaron
10- anfitriona
Explanation:
15. Di
16. Le
17. leremos
18. mira
De repente is what I would say is the answer
Conocer = to be familiar with (usually a person)
Saber = to know (a fact/etc.)