As students we should ______ all our time and energy on our study. ( ).
A: concentrate
B: cost
C: put
D: have
A: concentrate
B: cost
C: put
D: have
举一反三
- I think it necessary we should study hard in all our life.
- We have all been ______ of selfishness at some time in our lives.
- It is high time that we encouraged our students working harder.
- We all have obligations to our ___ men.
- All the students of our school study English ________. A: hard B: herd C: head D: Hred