___ I read your advert, I decided to buy the watch ____ you claimed it worked in all conditions ____ in water and extreme heat.
_____ the watch and see if you can find out what’s wrong with it.
John is a good swimmer, but I don’t like the way ____ he always shows off in front of everyone.
_____ you understand the rules of the game, you will enjoy it.
The child asked his mother ______ go out to play tennis.
Mr. Zhang, our math teacher, is strict with students and serious in teaching work, so he ____.