This year’s National Day ____ in a practical way, which is reported in People’s Daily.   
#103596
A
is to be observed
B
observe
C
observes
D
is to observe
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Large quantities of oil      in a place near my hometown recently. 
#102718
A
has discovered
B
have discovered
C
has been discovered
D
have been discovered
Helen ________ her keys in the office so she had to wait until her husband ______ home. 
#101502
A
has left; comes
B
left; had come
C
had left; came
D
had left; would come