Какое мноественое число у словf glass

Задание:
Составь предложение используя только эти слова(но они должны использова все):
(Слова с переводом)
Were-Были,
England-Англия,
Summer-Лето,
In-В(предлог),
They-(связка)
Last-Последней.
И прошу пишите предложение на Английском!

1. The environment … (be) much cleaner if people … (not use) so many chemicals.
2. I … (help) if I … (have) more time.
3. If I … (not go) to that exhibition in December, I … (not meet) him.
4. If she … (not study) so hard last month, she … (not pass) her Maths exam.
5. If I … (win) lots of money, I … (plant) lots of beautiful gardens in the cities.
6. If you … (get up) earlier, you … (not miss) the 8 o’clock train.
7. If people … (not drop) so much litter, our streets … (be) much cleaner.
8. I … (go) to the cinema tonight if I … (not be) so tired.
9. If he … (inform) me earlier, I … (do) something about it.
10. What … (you, do) if a fire … (break out) in your house?
11. If I … (speak) three foreign languages, I … (get) that fantastic job.
12. If you … (not read) the book in your childhood, you … (not answer) that simple question and won the prize.
13. She … (not disturb) if it (not be) that important.