---- A number of people _______learning English nowadays.

-----Yes. The number of people who are learning English _______increasing.

A. is;is                            B. are; are          C. are;is              D. is; are

A number of people have posted their own videos on the website You Tube, ____________their attempts to become “musicians”.

A number of people suffer ill effects from drugs ______ they take the drug exactly as directed.

 A number of people consider it bad _________ to smoke in rail station’s waiting area.

A number of people suffering cancer is increasing very fast.