A.because of
B.because his
C.for being
D.as to
A. White persisted in his researc
B.Because of
C.As to
D.In spite of
E.In view of
A.if
B.unless
C.because
D.though
His friends are not happy with him because he always turns down their invitations () ill health.
A、on the ground of
B、on the strength of
C、in view of
D、by means of
A.failed to
B.failed in
C.failed of
D.failed on
A.sick holiday
B.sick vacation
C.leave
D.sick leave
A.the boy was homesick
B.he hoped his son would like oysters as much as he did
C.it tasted better than a bacon sandwich
D.the boy was feeling as gloomy as the skies and the sea
A.efficient
B.effective
C.effect
D.inefficient