Câu 1: Cho tam giác ABC nhọn. Gọi D,E là chân đường cao vẽ từ B,C xuống AC, AB. C/m a) góc ABC = ACE,

        b) BD + CE < AB + AC

Câu 2: Cho tam giác ABC . D là điểm nằm giữa B, C

c/m  AD< AB + AC + BC : 2

     ***Hic Hic, mụi ngừi giúp mình với ặ

Nhận xét sự phân bố môi trường hoang mạc ở châu Phi

II. Supply the correct form of the word in parentheses to complete each sentence. 

1. The ______________ she gave last night was marvelous.(perform)

2. Water puppetry is a______________art form. (tradition)

3. You should eat______________ by reducing fat in your diet. (health)

4. How about ______________to the Exhibition of Modern Art?(go)

III. Complete the sentences with the correct tense or form of the verbs in brackets.

1. Pho______________ (become) more and more popular in Saigon since 1954.

2. The children ___________(play) volleyball on the beach at the moment.

3. ______________ (you/ eat) fried chicken last night?

4. Sofia_____________(not/ enjoy) collecting stamps in her free time.