---- “I haven't heard from Henry for a long time.”------ “What do you suppose_____ to him?”
#104379
A
was happening
B
to happen
C
has happened
D
had happened
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At this time tomorrow ____over the Atlantic.
#99290
A
we’re going to fly
B
we’ll be flying
C
we’ll fly
D
we’re to fly
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