3. Complete the following sentences with phrases or expressions from the passage. Change the form where necessary.
1. In a virtual classroom teachers can still a particular student to answer a question via RealAudio. 2. You can your message in the text-box and click the box "private message", then your words are submitted to only one person. 3. If you are not satisfied with the goods you buy in our store, you may return them in a week and your money will be back to you . 4. When I was waiting for my enrollment into the university in the long summer vacation, every single day was like a whole year--this was really a . 5. The restaurant people smoking. As a non-smoker I won't step into it.
Answer: 1.call on 2.type out 3.100 percent 4.stretch of uncertainty 5.is packed with