So although Fleming discovered penicillin, it was over a decade ___________someone else turned penicillin into the great drug of the 20th century.
| A．when | B．that | C．before | D．unless |
—I’m worrying about the coming examination.I’m afraid I cannot pass it.
—________！I’m sure you’ll make it.
| A．Go ahead | B．Good luck |
| C．No problem | D．Don’t lose heart |
—Would you mind me opening the window，sir?
—________.I am feeling a bit chilly.
| A．By all means | B．Not in the least |
| C．I’m afraid not | D．I’d rather you didn’t |
It was half a year________my good friend returned to his hometown.
| A．before | B．since |
| C．that | D．when |
—When did you get home last night?
—It was almost midnight________we arrived home.
| A．that | B．before |
| C．since | D．when |
It saves time in the kitchen to have things you use a lot________easy reach.
| A．near | B．upon |
| C．within | D．around |