Ha Noi is much (populous) (a)   than my hometown.

The city center is (densely) (a)   populated than the suburbs.

Jim boasted that he could run (faster/ fastlier) than anyone else in his class.

(a)  

If you had tried (harder/ more hardly), you would have passed the test.

(a)  

Although my computer is old-fashioned, it runs (smoother/ more smoothly) than many of the modern ones.

(a)  

My current house is more spacious than the old one.

-> My old house (a)  

Jane decorated her cake more beautifully than I did.

->I

(a)  

Admittedly, I anticipated a (good) (a)   performance of yours. You didn’t prepare well for this, did you?

By far, this is (stunning) (a)   scene I have ever seen.