A balloon as it is filled with air.
| A．is increased | B．increases | C．expands | D．is expanded |
The famous writer our Chinese teacher often referred ________ at our school yesterday.
| A．to arrive | B．arrived | C．to arriving | D．to arrived |
Please go ______ the ship quickly. There is only ten minutes left.
| A．board | B．broad | C．aboard | D．abroad |
The question came up at the meeting _______ we had enough money for our research.
| A．whether | B．that | C．if | D．what |
－Where is the shooting center?
－It is about 50 kilometres ________ the city of Beijing.
A. in south of B. the south of D. southern of D. south of
Word has come____ some American guests will come for a visit to our school next week.
| A．what | B．that | C．whether | D．which |