Callan New Edition Stage 9 Lesson 142 on page 801 in ''REVISION EXERCISE 64'' and start with item # 10 What does the idiom "touch and go" mean?

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Revision Exercise 64 (Lessons 132 - 133)  Q.What does the idiom "touch and go" mean?  •The idiom "touch and go" means "very uncertain".  Q.When do we use the verb "wish" followed by the word "would"?  •We use the verb "wish" followed by the word "would" when we are unhappy or irritated about something that is happening and we want the situation to change.  Q.Would you recommend hitchhiking as a good way for visitors to travel around your country?  •No, I wouldn't recommend hitchhiking as a good way for visitors to travel around my country.  Q.Of all your personal possessions, which is the most dear to you?  •Of all my personal possessions, my car is the most dear to me.  Q.If you have a headache, what do you think is the best way to ease the pain?  •If I have a headache, I think the best way to ease the pain is to take a medicine.  Q.Have you ever been obliged to appear in court for any reason?  •No, I've never been obliged to appear in court for any reason.  Q.If a thief robbed you of something in the street and ran away, what would you do?  •If a thief robbed me of something in the street and ran away, I'd chase them.  Q.What kind of objects must be handled very gently when we touch them?  •The kind of objects that must be handled very gently when we touch them are Jewelries.  Q.Why do they include instruction booklets with new products like televisions and microwaves?  •They include instruction booklets with new products like televisions and microwaves to enable users to understand how they work and what they can do.  Q.Name a tough metal, please.  •Steel is a tough metal  Q.What does the idiom "can't make head or tail of it" mean?  •The idiom "can't make head or tail of it" means "can't understand it at all  GRAMMAR  When we use passive voice. 1. ) when we don't know who does the action: for example, "My car has been stolen!";  2) when we don't want to say who does the action: for example. "You were seen entering the office without permission";  3) when it is not important who does the action: for example, "The Eiffel Tower was built in i 889";  4) when it is obvious who does the action: for example, "He was arrested for stealing".