__________ like Tiger Watch have been filmed around the world.
| A．The number of the documentaries |
| B．A number of documentaries |
| C．A bit documentaries |
| D．A great deal documentaries |
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 |
Teachers should _____ their students to practice _____ English as much as possible.
| A．encourage; speaking | B．let; speak |
| C．make; speak | D．keep;speaking |
China takes the leading position _____ space industry.
| A．in | B．at | C．of | D．up |
I spend much money on books _____ I am not rich.
| A．but | B．so | C．even though | D．as if |
—What a nice classroom!
—It _____ every day.
| A．is cleaning | B．has cleaned | C．must clean | D．is cleaned |