When was the first antibiotic—arsphenamine discovered? It was discovered by Paul Ehr
()the 1500's () the first Europeans explored the coast of California.
A.It was not until ... when
B.It is until ... that
C.It is not until ... when
D.It was not until ... that
Believe it or not, when first ______ to Europe, tomato was thought to be poisonous.
A.to introduce
B.introducing
C.introduced
D.to be introduced
A.make
B.made
C.to make
D.making
When I first arrived in Japan, I was surprised ______ the way people greeted each other.
A.of
B.to
C.with
D.at
A.Sleep is the first thing that can be sacrificed when one is busy.
B.They need more sleep to feel ideally vigorous.
C.To sleep is something one can do at any time of the day.
D.Less sleep does harm to their health.
When he first started in university, he really felt at ______ with his major--economics.
A.shore
B.bank
C.ocean
D.sea