Вставьте место точек! 15. vegetables ……. well in summer, but you can`t grow them in winter. a) are growing b) grow c) grew d) are grew

Это general statement. 
Т.е. это общее утверждение о порядке вещей в мире. 

Овощи хорошо растут летом. 

Т.е. они в принципе хорошо не растут летом. Не росли в не будут расти в будущем, не растут именно сейчас, а просто в принципе растут растут хорошо летом. 

Следовательно должно использоваться время Present Simple. 
b) grow

Vegetables grow well in summer, but you can't grow them in winter. 

P.S.Мне кажется в задании ошибка, потому что BUT тут не подходит. 
Получается, что 
Овощи хорошо растут летом, но вы не можете выращивать их зимой. 
Звучит немного глупо.

Vegetables are growing Well in summer,but you can't grow them in winter

1 He had an accident. He broke his leg  PAST SIMPLE

2 Have you ever had quinsy? Yes, i have   PRESENT PERFECT

When did you have it? I had it last winter   PAST SIMPLE

3 You cut your finger. How did it happened?   PAST SIMPLE

4 Has Jane recovered yet? PRESENT PERFECT

5 Mr. Wood didn't feel well lately. He first fainted last week.  PAST SIMPLE

6 The patient has confined to bed for over a month.  PRESENT PERFECT

7 The pain hasn't subsided yet.  PRESENT PERFECT

8 A thorough examination confirmed the diagnosis.  PAST SIMPLE

9 The patient has discharged from hospital already. PRESENT PERFECT

10 What did the examination reveal?  PAST SIMPLE

L am a student.
I'm thirteen years old.
I have a dog.
I don't have a cat.

John is my best friend.
he is thirteen years old.
he has a ball.
he doesn't have shoes.

my dog's name is Sumo
he is...
my dog has
my dog doesn't have

my house is
it is...
it has...
it doesn't have...

Mrare...
They are...
They have...
They don't have...

Jack is...
he is...
He has...
He doesn't have...

My bike is...
it is...
it has...
it doesn't have...

My uncle's car is...
it is...
it has...
it doesn't have...

My aunt's name is...
she is...
she has...
she doesn't have...