----- Believe it or not, my sister and I are twins. ----Oh, you must have had the case ________ you were taken for your sister.
Shortly after the accident,two ________ police were sent to the spot to keep order.
Suddenly my friend noticed another classmate passing by the restaurant and he________to stop him.
She________Japanese when she was in Japan.Now she can speak it freely.
Care should be taken at all times to________the instrument from dust and damp.
It’s often less expensive to buy goods in ________quantity,but you’d better examine ________ quality before buying them.