Study hard, and will be difficult.
| A．everything | B．anything | C．nothing | D．something |
Maria has _____ trouble _____ math, so she often asks her math teacher for help.
| A．much, understanding | B．no, with |
| C．many, understanding | D．not, to understand |
The rivers in Changshun are clearer than _____ in Wuhan..
| A．that | B．it | C．one | D．those |
—Does your father still smoke?
—No, he has succeeded in_____ smoking for three years.
| A．giving up | B．give up |
| C．gives up | D．gave up |
I think that you have made rapid _____ in math.
| A．a progress | B．progress |
| C．progresses | D．progressed |
I find _______necessary to do everything we can ____________protect the environment.
| A．it; do | B．this is; do to |
| C．it; to | D．it; in order that |