By serving others,a person focuses on someone other than himself or herself,_______can be very eye-opening and rewarding.
The question is _____easy, so everyone in our class can answer it.
Our lab is on the third _____ of a six—______ building.
The flowers ____ sweet in the garden in spring.
-----when has the country been open to international trade? -----1978, I suppose.
At the meeting they discussed three different____to the study of mathematics.