18. The more we explained to her, better understanding she had about computers. A. the B. to C. better D. computers 19. Did you have a chance to do any sightsee when you visited London? A. did B. a C. to do D. sightsee 20. The bridge who was built about 100 years ago is going to collapse. A. who B. about C. is D. collapse

`18`. 

`=>` `C`

`->` Better `->` The better

`-` Cấu trúc So sánh kép (The more - the more) với Adj:

   `+` The + Adj (so sánh hơn) + SV1, the + Adj (so sánh hơn) + SV2

Vd: The harder she tries, the better she achieves

`19`. 

`=>` `D`

`->` Sightsee `->` Sightseeing

`-` Sightseeing (n): chuyến tham quan

`20`.

`=>` `A`

`->` Who `->` Which

`+` Who: dùng để chỉ người (chủ ngữ)

       Whom: dùng để chỉ người (tân ngữ)

       Which: dùng để chỉ vật

`-` Vì bridge (cây cầu) là vật `->` dùng Which

`\text{@Bulletproof Boy Scout}`