89 The heavy rain prevented us from enjoying the trip

90 You had better not eat too many candied

91 He drives more slowly and more carefully than Lan does

92 The visitor spoke too quickly for me to understand

1 Can she look after herself while her mother is away?

2 Could you tell me where is the station?

3 The exam was not as difficult as we thought

4 It will be impossible for them to come on Saturday

5 Their father drove to London last Monday

6 You won't need to go to the meeting next week

7 Sonia isn't interested in Roller-skating

8 You had better ride the bike more carefully next time

9 I wasn't allowed to stay out late when I was young

10 He takes care of the sick people

1 best

2 mother's

3 live

4 but

5 her

6 is

7 have

8 and

9 for

10 age

a. Cậu ơi, cho tớ mượn một cuốn truyện tranh nhé!

b. Chị ơi, chị lấy giúp em một cốc nước nhé!

c. Xin phép bố mẹ cho con về quê thăm ông bà ạ! 

6:

a: Xét tứ giác BHCD có

M là trung điểm chung của BC và HD

nên BHCD là hình bình hành

b: BHCD là hình bình hành

=>BH//CD và CH//BD

BH//CD

BH vuông góc AC

Do đó: CD vuông góc AC

=>ΔCAD vuông tại C

CH//BD

CH vuông góc AB

Do đó: BD vuông góc BA

=>ΔABD vuông tại B

c: Xét tứ giác ABDC có

\(\widehat{ABD}+\widehat{ACD}=90^0+90^0=180^0\)

=>ABDC là tứ giác nội tiếp đường tròn đường kính AD

=>ABDC nội tiếp (I)

=>IA=IB=IC=ID

120 dm² x 5 + 4m² = 600 dm² +  4 m² = 6 m² + 4m² = 10 m²