选择括号中适当的词填入横线上。每小题1分，共10分。
（1）They're David and Sam.  These  are          (they, their）desk.    
（2）Jim is a student.          (his, he）bag is green.  
（3）Put            (on, off）your clothes, Jenny.
（4）Happy birthday! This present is           (for, to）you.
（5）I go to school            ( by, on）bus.
（6）Go              (straight, along）this street and turn right.
（7）Look ! My sister _________ ( plays,  is playing ）with the toy cars.
（8）I _______ ( get,got ）up at 6:30 every morning.
（9）Tom’s mother _______ (have,has）a nice jacket.
（10）Can you _______ (make,making ）a paper plane for me ?