24. There were two boys in the lab,__________did the experiment successfully.
According to today’s newspaper, the escaped prisoner threatened to _____ the police station in the near future.
Mary heard ____strange sound at ____midnight outside her house and got scared.
He opened the door. There ________ he had never seen before.
The hospital staff burst into cheers after the doctors completed a 20hour operation to have _______oneyearold twins at the head.
—What does this modernday dinosaur look like?—The tongue of this animal can be extended ________ of its body.