They couldn’t understand the lecturer because she spoke so fast. too
A.The lecturer spoke too quickly for them to understand.
B.The lecturer spoke too fast for them understand.
C.The lecturer spoke too fast for them to understand.
D.Both A and C

I advise you to think carefully before accepting William’s offer. better
A.You had better think carefully before accepting William’s offer.
B.You had better thinking carefully before accepting William’s offer.
C.You had better to think carefully before accepting William’s offer.
D.You had better thought carefully before accepting William’s offer.

_____ my opinion, the Internet is a very fast and convenient way for me to get information.
A.From
B.In
C.Under
D.Through

I called the wrong number _____ accident.
A.off
B.on
C.with
D.by

Stay here till the lights ( turn ) __________ green.
A.turned
B.will turn
C.turn
D.would turn

While he ( learn ) __________ to drive he had twenty-five accidents.
A.was learning
B.has been learning
C.learned
D.learn

I suggest ( go ) __________ there on foot.
A.to go
B.having gone
C.going
D.went

CONVENIENT
A.convenience
B.inconvenience
C.conveniently
D.conveniences

RESEARCH
A.researching
B.reseaches
C.researchers
D.researched

DESIGN
A.designably
B.designate
C.designable
D.designed