The police are looking for a missing boy, who is believed _______ a white pullover and a blue jeans.
twice a year, whether it is a car ,a bus or a truck, is the rule that every driver must obey in this city.
to his scientific research, the professor cared little about his family.
Simon made a big bamboo box _______ the little sick bird till it could fly.
what their friendships are based upon, the important thing to remember is both of them are friendships.
Mum disagreed with my suggestion that we ________ skating this weekend.