(), the number of private cars will increase sharply in the coming couple of years.
A. Undoubtedly
B. Doubtedly
C. Undoubted

We can certainly deliver high-quality education to many...

单项选择题We can certainly deliver high-quality education to many students at much()cost.
A. low
B. lowest
C. lower

Keeping eye contact makes the other person()welcome and...

单项选择题Keeping eye contact makes the other person()welcome and comfortable.
A. feel
B. to feel
C. feeling

The news came()we won the first prize in the competitio...

单项选择题The news came()we won the first prize in the competition.
A. that
B. which
C. whether