His heart beats fast ______ he hears her voice.
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
Frank put the mediocre in the top drawer to make sure it would not be_______ to the kids.
---Do you want a lift home? ---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock _______.
It is reported that the police will soon ____ the case of two missing children.
------- What is the price of petrol these days -------Oh, it ______ sharply since last month.