There are many old trees in our school, each ________ about 100 years ago. 
#98197
A
dates back to
B
dating from
C
dated back
D
which dated to
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The split between humans and apes is believed by scientists______15 to 20 million years ago.
#90155
A
to be occurring
B
having occurred
C
to have occurred
D
to occur
---What caused the party to be postponed? ----_____the invitations .
#93393
A
Tom to delay sending
B
Tom’s delaying sending
C
Tom delaying to send
D
Tom delayed to send
Studies show that daydreaming contributes significantly to concentration powers and the ability _____ with others.
#94193
A
communicating
B
to be communicated
C
to communicate
D
to communicating