We （） one of the most significant achievements in the history of physics （） electrons w

We are having a () technical problem with one of our engines.

A.light

B.slight

C.bright

D.slim

will sLed by the Prty, ___ we fight firmly with one hertnd one mind, depending upon science, we will surely defet SRS.in cse B．so frs C．even if D．so longs

A．in case

B．so far as

C．even if

D．so long as

He insisted that we all ____ in his office at one o'clock.

A) be B) to be C) would be D) shall be

A.ones

B.one

C.those

D.point

ink to useHello. It’s one of the first words we learn as babies, yet it’s one of the last ones we think to use as adults. That’s unfortunate, b 48 saying hello is more than just saying hello—it is recognition of another’s worth. How might the world change—how might we change—if we mastered this word To find o 49 , I spent one month saying hello to every person I met. Here’s what I’ve learned. It can boost （）

A.tested

B.examined

C.traced

D.rolled

A.opposable

B.superior

C.lovable

D.remote

We now know that about ____ of all the kinds of seaweed are animals.

A: one four

B: once four

C: once fourth

D: one fourth