Identify the error in each of the following sentences.
In 1964, a farmer claimed he saw an egg-shape object in one of his fields.




A.claimed
B.saw
C.egg-shape object
D.his fields

____________(19)




A.
B.
C.
D.

Huong wishes she _______ free time to visit her close friend in hospital.




A.to have
B.have
C.had
D.having

Remember to turn _______ the light when leaving the office.




A.off
B.on
C.down
D.in

A.disappointed
B.reduced
C.celebrated
D.needed

Choose the word that differs from the rest in the position of the main stress.




A.pollution
B.attractive
C.separate
D.activity

_________(46)




A.necessarily
B.certainly
C.fully
D.nearly

_________(51)




A.realizing
B.noticing
C.imagining
D.solving

_______(16)




A.domain
B.area
C.field
D.branch

The word "detectable" in line 21 is closest in meaning to __________ .




A.beneficial
B.special
C.measurable
D.separable