It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a few months．
| A．has been developed | B．is being developed |
| C．is developing | D．has developed |
Having mastered the technologies of manned spacecraft, China became the third country in the world ______ manned spaceflight independently.
| A．develop | B．to develop | C．developing | D．developed |
______ sweet, this type of flower sells the best in the market.
| A．Smelt | B．Being smelt | C．To smell | D．Smelling |
The most widely accepted theory about the beginning of drama is based on the concept ______ drama evolved from ritual.
| A．which | B．that | C．when | D．as |
The growing speed of a plant is influenced by a number of factors, ______ are beyond our control.
| A．most of them | B．most of what | C．most of which | D．most of that |
______ Chief Engineer, as his family had expected, made his father happy and proud.
| A．Mike being appointed | B．Mike’s appointed |
| C．Mike appointing | D．Mike’s being appointed |