Right now, lots of people search for products on the Internet but still buy them at stores. Internet shopping will really ____ when people are sure that it is safe.

Too much work and too little rest ____ to his illness.

Has Tom finished writing his essay today? — I have no ideaHe ______ it this morning

________ matters most in learning English is enough practice

13. The book ___ 50 maps , ___a Chinese map and an American map .