—____ is the letter from?—It’s from Mike, my pen pal.
____ are you driving? I think it’s more than 100 kilometers an hour now.
To be a good teacher, you ___ be able to hold the attention and interest of your students.
Bobby didn’t have dinner ___he finished designing the plans.
During the summer holidays, the girl practised ___ the piano for three hours every day.
Nowadays most of the Chinese have decided ____ a trip to Malaysia.