4.
b. is the bus going to arrive on time? -Yes^ it is
c. Is there going to enough time?- no, it isn't
d. Are they going to have a good time ?- yes, they are
e. is his plan going to work? - yes, it is
f. is Sue going to pass exam ?- no, she isn't
g. is Kelvin going to earn a lot of money?- no he isn't
h. are the students going to learn English?- yes, they are