Lab workers must wear protective ______.
It is amazing that the little boy can swim ________the river ________100 meters in width.
We used to work in the same office and we____ often have coffee together, which I missed so much years later.
— Have you ________ how much the trip will cost? —I’m working on it; just have a little patience.
I invited him to dinner, but he___ my invitation with thanks.
The population of this city ,forty percent of which_____, ______ 15% in the last three years