Only by practising a few hours every day _______ be able to master the language.
| A．you can | B．will you |
| C．you will | D．can you |
A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.
| A．carrying out | B． carried out | C．working out | D．worked out |
It’s obvious that the Beijing Olympic Gamesa great success．
A．kept B．showed C proved D．remained
Scientists ____ thousands of chemicals before they decided on the right one in the end.
| A．tried out | B．found out | C．worked out | D．turned out |
The deserted island is only _______ by boat.
| A．suitable | B．practical | C．available | D．accessible |
As is widely acknowledged, a great number of traffic accidents ____ numerous deaths and countless property loss all over the world every year.
| A．depend on | B．contribute to | C．result from | D．aim at |