An important _____ of taking mobile phones is that it’s easy to keep in touch.
| A．theme | B．edge | C．height | D．advantage |
—______ do you write to your pen friend?
—Once a week.
A. How long B. How soon C. How often
As students, we should ________ our study.
A.pay for
B.spend on
C.concentrate on
Many students will be ________ if the class is boring.
A.sleep B.sleepy C.sleeping
Students should pay attention to ________ the teacher in class.
A.listening to
B.listen to
C.hearing of
When I have problems I often ask my teacher ___ .
A. to helping
B. help
C. for help