Tom and Jack like to speak ________ the phone. [ ]

You may easily lose your way in Shanghai ______ you don’t have a map or a guide.

I’ve become good friends with several of the students in my school _______ I met in the English speech competition last year.

Eating _______ is bad for your health. Because you may be ______ fat.

The only question __________ I ask for you was how to used the computer .