—It’s reported that the new underground line has been completed.—Yes but it hasn’t been made clear _____it’s to be opened to traffic.
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.