Угол при меньшем основании трапеции равен 120º, три стороны равны 6 см. Найдите среднюю линию трапеции

ПОЖАЛУЙСТА,ПОМОГИТЕ ЛЮДИ ДОБРЫЕ С АНГЛИЙСКИМ,ПРОШУ! 

1. Fill in
the blanks with сап/can't or be (not)
able to in the proper form.
1. He___speak English rather fluently, but that time
he___say a word. 2. He has never___speak in public. 3.1 used to___speak German
very well. 4. You ___marry her, but you___make her love you. 5.1___ do it on
Friday, but I___do it next week. 6.___you give me a lift to the station,
please? 7.1 used___eat a kilo of sweets for supper. 8.1 have never___ride a
bicycle. 9. You___see him at the meeting. He was ill. 10. I'd like ___ski very
well. 11. Luckily I___find a taxi. 12.1 ___drive when I was fifteen.
13.1___hear somebody running. 14. He did not want to go there, but we___to
persuade him. 15. She sighed. I___feel her hands shaking.
2. Fill in
the blanks with may /might or can/ could and make all necessary
changes.
1. You___(warn) me about it beforehand. 2. The weather is changing.
It___(start) raining. 3. No, he___ (not hear) your name. We
tried to speak in a whisper. 4. He___(not hear) your name. That's why he did not say
anything. 5.
She ___ (not notice) us. We were
standing too far away. 6. She___(not notice) us though
we were standing beside her. 7.___I use your name as a referee? 8. She___(not hear) the news, that's why she
looks as if nothing had happened. 9. She___(not hear) the news, nobody___tell her about it. 10. The professor says that
I___(rewrite) the essay. 11.___I use your phone? 12. He___(help) them when they
were in trouble. 13.___he
(say) it? No, it's not like him. He is a man of few words.