Какое проверочное слово к слову сумерки

Свет помЕрк в глазах.

Меркнуть ( корень -мерк- ).

On winter holiday на зимних каникулах
I will sleep я буду спать
I will meet with my friends and we will go skating or skiing or walking. я встречусь со своими друзьями и мы пойдём кататься на коньках или лыжах или просто гулять.
Maybe we will go to the cinema. может быть мы сходим в кино.
of course I will spend much time with my family. конечно я проведут много времени со своей семьей.
we will go shopping, go to a cafe and we will talk, laugh and take photos. мы пойдём по магазинам, зайдем в кафе, мы будем болтать, смеяться и фотографироваться.

(But my parents were at the theatre)
(But I was in the Crimea)
(But my nephew is a schoolboy)
(But his friend is an engineer)
(But Jane will be a good wife for Tom)
(But I was lazy)
(But my friend was late)
(But his sister is a doctor)
(But he will be at 12)
(But my brother is going to marry.)

His sister is a student.
Her brothers is a worker.
My grandfather is old.
Our house is warm and light.
Is your friend a doctor?
Is his English good?
What is its meaning?
Their friends are not students.
Its colour is unusual.
Its pronunciation is difficult.

-His brother's wife works at the hospital.
-This girl's name is Jane.
-My friend's family as large.
-This woman's husband is a worker.
-My sons' room is warm and light.
-The boys' book are on the desk.
-The children's dog is funny.