We all feel it is you as well as your wife that ________ for your son’s bad performance at school.
--- What did he say? ---- He said he ________ the sentence in his own words.
I have no doubt in my mind______ they will be glad to see me.
Eric received training in computer for one year, _______ he found a job in a big company.
With the help of high technology, many new substances(物质)______in the past years.
______ is know to us all, good friends ______ happiness and value to our life.