Do you know the meaning of the new word It puzzles me a lot.—I’ve no idea. But I think you can look it up in a .

He is known _____ a scientistand famous _____ his research on rice.

the sentence , so he asked the teacher to explain it again.

Hospital doctors don’t go out very often as their work ____all their time.

For miles around me there was nothing but an island, without a single plant or tree ______