Hi Behnam. I've never in my 58 years as an English used those phrases. The only similar phrase would be something like 'I love my mother twice as much as I love anyone else."

Yes they do. Keeping something undercover is a way of stopping it from getting out. You could use both sentences if you like to really reinforce what's been said. "I really want to keep this news undercover, I don't want it getting out to the media."

Is 'She' still teaching at the school? The tenses are very confusing.

Hi Maureen. Firstly, I'm not an expert in English grammar, but I am a journalist and write all day, so I'll try to explain the answers for you. 1. She 'was thinking' of running away, but she was so scared that her legs simply could not move. To me it's the recency of the event that makes it 'was'. 'Had thought' places something very long ago. For example. 'On Monday I'd thought about making a cake.' Or 'I was thinking about making a cake.' Both effectively past tense, just one is further back. The use of 'but she -was- so scared' is the clue here. If it had said. 'she -had been- so scared' you would have been correct. 2. Up till now, there is no news about our lost puppy. The phrase 'Up till now' places the sentence in the present tense. Up till earlier today, there has been no news about our lost puppy. Earlier today is past tense. 3. By the time the bell rang, the children had finished their work. This can really only be past or future tense. This is past tense whereas 'By the time the bell rings, the children will have finished their work.' is future conditional. I hope that that helps in some way.

Yes it is, but it's fairly formal. I'd say 'What time could we possibly meet?' or 'What time could we meet?' or 'When could we possibly meet?' All of them are much the same.

Hi Naima. 'On the game' in Australia is an old expression for a prostitute that is working on the street. "She's on the game, mate" but I understand what you are really saying is 'let me know if you are game' which has a complete different meaning.

About my working holiday

When I was 25 years old I received a working holiday visa to Australia.
Firstly I stayed in Brisbane, which was near my language school.
I lived in homestay for the first month.
I went to the language school for three months.
My English was bad and I was in a beginner's class during the time I was a student.
However,  I could communicate with my friends, so I was satisfied, except I couldn't get any nice jobs.
Now I feel regretful that I didn't study hard and didn't make a lot of friends.
I stayed with a few friends while I lived there.

Firstly I stayed in Brisbane, which was near my language school.
I lived in homestay for the first month.

This could be written as one paragraph

For the first month I stayed in a homestay in Brisbane. It was near to the language school that I was attending.

Yes. It does mean exactly the same as "drop out of school" or "to finish school". It is confusing though because it can also mean a temporary departure, as in. "I had to leave school to go to the dentist." I hope that helps.