Cho tam giác đều ABC trên AB lấy D sao cho AD =1/3 AB.Từ D kẻ đường thẳng vuông góc với AB cắt AC ở E qua E kẻ đường thẳng vuông góc với AC cắt BC ở F .CMR

a,DF vuông góc với BC

b, Tanm giác DEF đều

Fill in the each blank wit one correct preposition

1 Peter is proud............his new bike

2 We wear sunglasses to protect our eyes........the sun

3 I hang the picture.......the clock and the calender

4 Hold............a minute while i get my breath back

5 he suported the plan......all his heart

6 she is very excited......... watching this film

7 we are looking forward..............seeing you again

8 i'm sure you will succeed..........this entrance test

9 she is ashamed........what she has done

10 i congratunate Susan............passing the exam

Viết dạng đúng của động từ trong ngoặc

1 We spent three hours (clean) the house

2 She hates (punish) by her mother

3 The weather prevented us from (go) out

4 The students are made (learn) harder

5 Peter suggested that she (go) away

6My mother told me (do) my home work

7 Her father said that she (cook) dinner then

8 The boy (stand) out side the window is my friend