It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
A．which B．what C．that D．when
Teaching ___ child to cook will improve many of ___ skills that he or she will need later in life．
A．/; the B．a; the C．a ; / D．the; a
—Rather than ___ on a crowded bus, he always prefers ___ a bicycle.
A. ride; to ride B. riding; ride C. ride; ride D. to ride; Riding
Kate didn’t come yesterday, or you ________ her.
A. would see B. were to see C. had seen D. might have seen
I walked in our garden, ________Tom and Jim were tying a big sign onto one of the trees.
A. which B. when C. where D. that
The study was carried out in one small town so we can’t be sure that the results are truly ________.
A. exact B. proper C. representative D. natural
