Как правильно писать предложения:
I have a lot (of/--) homework every day.
Not many ideas came (in/to) my head.
(At/in) the beginning (of/at) the lesson all pupils stand up.
Please, hand (to/in) your exercise-books.
Спасибо заранее)

I have a lot of homework every day.

Not many ideas came to my head.

At the beginning of the lesson all pupils stand up.

Please, hand in your exercise-books.