--Has Billy finished his homework today?
--I have no idea. He ______ it this morning.
| A．would do | B．was doing |
| C．has done | D．had done |
Born and ______ in Central China’s Hubei Province, Wang Luoyong learned Peking Opera at the age of 11 in Hubei Experimental Peking Opera School.
| A．raising | B．risen | C．raised | D．being raised |
Parents ___ much importance to education. They will do their best to give their children that priceless gift.
| A．attach | B．pay | C．link | D．apply |
When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
| A．refers to | B．related to | C．comes to | D．talks to |
Would it be ___ for you to pick me up at four o’clock and take me to the airport?
| A．free | B．vacant | C．handy | D．convenient |
—You speak very good French!
—Thanks. I ______ French in Sichuan University for four years.
| A．studied | B．study | C．was studying | D．had studied |