Only by practising constantly__________ greater progress.
| A．we can make | B．then we will make |
| C．can we make | D．we must make |
This is the _____ piano on which the composer created some of his greatest works.
| A．actual | B．genuine | C．real | D．original |
He was deep in thought with his eyes_____ on the ceiling.
| A．fixed | B．fixing | C．fix | D．to be fixing |
The car was completely _____ and the driver seriously injured.
| A．broken off | B．taken off | C．written off | D．picked up |
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering | C．are uncovering | D．have uncovered |
______run fast should take part in the 400-meter race tomorrow.
| A．Anyone who | B．Those who | C．No matter who | D．Whoever |