Teenagers should be encouraged to go _____ and be close to nature.
In ancient China, horses are often ___ good luck .
____ 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.