Now that he ____ that he had stolen the money, you should have forgiven him. [ ]

y,____ with his school work every day. feltrather tired and wanted to have a whole day to relax.

Some young people these days just ________ go out oftheir homes to contact the real world．

Before you ______ the design of this product, you need to study the market carefully. [ ]

With the help of high technology, many new substances（物质）______in the past years