△ variety (n.) 不同種類，變化，多樣化，多變性，品種，變種

a variety of → various of → various (adj.)

He offered a variety of excuses to?refuse her invitation.

v.?A vary from B in sth. A和B在某方面有不同

vary from … to …

vary between … and … 由……到……不等

These apples vary in size from small to big.

△It takes / took sb. sth. to do

→It takes / took sth. for sb. to do

It takes one a lot of courage to tell the truth.

△ the first time

for the first time

The first time I came to her home, she was singing.

It / This /?That is / was the first time that …

This is the first time I have seen such a wonderful film.

This was the first time I had seen such a wonderful film.

He experienced great hardship for the first time in his life.

△ come onto / on the market 上市

After MP3 players came onto the market, they soon became popular among young people.