do you know how many of them joined in the research project 这句中，know后面是不是省略了that?可以补上去吗？那that可以这样和how连用吗？research在这里是名词的话，能用来修饰project吗？

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• do you know how many of them joined in the research project 这句中，know后面是不是省略了that?可以补上去吗？那that可以这样和how连用吗？research在这里是名词的话，能用来修饰project吗？
• Many young people can use the computer, but few of them know how to look aft……Many young people can use the computer, but few of them know how to look after them. Remember the following when you use the computer.l Keep your computer in a cool, dry room. Too much or too little heat is bad for computers. Damp is also bad for them. Most computers work best at a temperature of 5-30 degrees centigrade.l Do not let people smoke cigarettes ne
• 阅读理解Many people can use the computer,but few of them know how to look after them.Remember the following when you use the computer.1.Keep your computer in a cool,dry room.Too much heat（热量）is bad for computers.2.Do not let people smoke near your computer.It is bad for many parts of a computer.3.Do not eat or drink when you are near your computer.Pieces of food and a little water in the keyboard are also bad for a computer.4.You should often clean your c