Despite their______ of interest，Fleming kept trying to develop the chemical ______ it would be safe and effective.
| A．lacking；in order to | B．lack；so that | C．lack；so as to | D．lacking；so that |
The traffic is heavy these days. I ________ arrive a bit late, so could you save me a place?
| A．can’t | B．must | C．need | D．may |
Allow children the space to voice their opinions, ________ they are different from your own.
| A．until | B．even if | C．unless | D．as though |
. We are invited to a party ________ in our club next Friday.
| A．to be held | B．held | C．being held | D．holding |
He worked hard to ________ some money for his retirement.
| A．set about | B．set out | C．set off | D．set aside |
Why not try your luck downtown, Bob? That’s ________ the best jobs are.
| A．where | B．what | C．when | D．why |