In many countries, some scientists are already _______ research in order to produce a cloned human baby.

Edward, you play so well, but I          you played the piano.

People often have this belief ______ development is bad for the environment, but this does not have to be true.

 If we ______ the other road, we might have arrived here in time for the meeting.

Jessie, my best friend _______ me of some really bad things just to hurt me. I felt betrayed.

        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.

You _____ down everything I said! You can find it on this sheet I’m handing out.