Alone in the lab on Sundays, the young scientist was so busy with his research work that he felt _____ but lonely.

 When you learn English, you have to choose which accent to _____, American or British.

When a new disease breaks out, experts must      ________ what to do in the fastest way.

Many areas were stricken by the typhoon, and it was quite difficult to ______ the exact losses.

— You seem to be on top of the world. — Of course. There’s            more exciting than seeing your name in print.