11.C
12.B(from...to...:từ...tới...)
13.A(anything:phủ định,since-.HTHT)
14.A(so sánh hơn)
15.Mary is the most intelligent in this class.(so sánh nhất)
16.Dam Vinh Hung sings well.
17.Huong isn't as good painter as Giang.(so sánh bằng)
18.She is interested in acting.(be interested in+N/V-ing:hứng thú với cái gì/làm gì)
19.If I were you,I could solve this problem.(if 2)
20.Because of the fine weather today,we hang out with our friends.(Because of+N/V-ing)