There is not a big yard in our school, so we can't play sports at school

the following sentences.
D on the answer sheet to indicate the
Question 47: There is not a big yard in our school, so we can't play sports at school.
A. If there wasn't a big yard in our school, we couldn't play sports at school.
B. If there was a big yard in our school, we could play sports at school.
C. If there is a big yard in our school, we could play sports at school.
D. If there were a big yard in our school, we could play sports at school.
Question 48: "Why don't you take an extensive Italian course?" he said to me.
A. He advised me to taking an extensive Italian course.
B. He recommended taking an extensive Italian course.
C. He told me not to take an extensive Italian course.
D. He suggested that I should take an extensive Italian course.
Question 49: Sue hasn't eaten fast food for two months.
A. The last time Sue ate fast food was two months ago.
B. Sue didn't use to eat fast food.
C. Sue last ate fast food since two months.
D. The last time Sue ate fast food two months ago.
Question 50: People knew that bullying has a harmful influence on teenagers.
A. It was known that bullying had a harmful influence on teenagers.
B. It is known that bullying has a harmful influence on teenagers.
C. Bullying was known to have had a harmful influence on teenagers.
D. Bullying was known to have a harmful influence on teenagers.