Once_______ with the latest technology, many vehicle manufacturing factories are believed to reduce emissions of nitrogen oxides (NOx) drastically

A. Hardly had the play started when there was a power failure

B. No earlier had the play started than there was a power failure

C. Hardly did the play start then there was a power failure

D. No sooner did the play start before there was a power failure

A. mouth 

B. ear 

C. eye 

D. hand 

A. for fear that 

B. so that 

C. now that 

D. provided that 

A. The professor told his student that he wished he could finish the pre-lab report before carrying out the experiment

B. The professor advised his student to try to finish the pre-lab report before carrying out the experiment

C. The professor complained that his student didn’t finish the pre-lab report before carrying out the experiment

D. The professor regretted that his student didn't try to finish the pre-lab report before carrying out the experiment

A. with 

B. to 

C. for 

D. at 

A. revealing the financial problems 

B. solving financial problems 

C. causing the financial problems 

D. concealing the financial problems

A. laborious 

B. strenuous 

C. arduous 

D. synchronous