I have to walk to school today because my bike _____now.
#101260
A
is being repaired
B
has been repaired
C
is repaired
D
has repaired
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 Hurry up. I_____ for Korea to visit my uncle; The plane_____ at 10:00.
#101161
A
am leaving; will leave
B
leaves; is leaving
C
am leaving; leaves
D
will leave; is leaving
Experiments of this kind ___in both the U.S and Europe well before the Second World War. 
#102411
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
 His sister left home in 1998,and ________ since.
#99572
A
had not been heard of
B
has not been heard of
C
had not heard of
D
has not heard of