30. British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous situations________ others.

It will be a big help if you go to the store and get what we need for dinner______, I’ll set the table

ine bought a postcard of the placeshe was visiting, addressed _______ to _______ and then posted it at the nearbypost office.

My wife ______the night shift when my plane ______That’s why no one is to meet me at the airport today

think we can________Mr White to support us.[ ]