Despite other scientists' __________ of interest, Fleming kept trying to develop the chemical __________ it would be safe and effective.
| A．lack； so as to |
| B．lacking； so as to |
| C．lack； so that |
| D．to lack； so that |
The authorities declared that because of the war petrol was _____ and had to be rationed (定量供应).
| A．inadequate | B．rare | C．lacked | D．scarce |
His name was on the _____ of my tongue, but I just couldn't recall it.
| A．end | B．point | C．edge | D．tip |
Feudal landlords, and imperialists are in no way more _____ than wolves.
| A．reasonable | B．regardless | C．ridiculous | D．rational |
She was putting on her watch when the _____ broke and it fell to the ground.
| A．belt | B．strap | C．tie | D．string |
Psychological studies show that some people are quick-tempered _____.
| A．at heart | B．on purpose | C．in person | D．by nature |