_________I came to see her yesterday, she was reading a book.
A.Before
B.When
C.While
D.After

___________(27)
A.all
B.every
C.any
D.some

It doesn’t cost much to run a solar power system.
A.A solar power system is quite cheap to set up.
B.Running a solar power system costs nothing.
C.A solar power system costs so much to run.
D.Running a solar power system is not costly.

__________(52)
A.consent
B.lead
C.undertake
D.tend

__________(54)
A.urge
B.press
C.insist
D.direct

What is an example of precipitation ?
A.wind
B.lightening
C.rain
D.thunder

__________(49)
A.information
B.layout
C.assembly
D.pattern

__________(50)
A.value
B.rate
C.ensure
D.determine

__________(51)
A.pass
B.omit
C.ignore
D.miss

I didn’t take sides during their disagreement because I liked both of them.
A.Their argument was a source of disappointment to me because I liked both of them.
B.I remained neutral during their disagreement because I liked both of them.
C.As I liked both of them , their argument made me disappointed.
D.I tried to stop their argument because I liked both of them.