Câu 29:Lan has studied English since she was five =>Lan started____________ A. Lan started studying English when she was five B. Lan started to study English since she was five C. Lan started to studying English when she was five D. Lan started studing English since she was five Câu 30: There isn' t much traffic in the village , so the air is very clean => Because________________ A.Because the air is clean , there isn ' t much traffic in the village B.A.Because there is not much traffic in the village , so the air is very clean C.Because there is not much traffic in the village , the air is very clean D. A.Because thereair is much traffic in the village , so the air isn't very clean 31: How long is it since you built this stilt house ?=> When A. When do you build this stilt house ? B.When did you build this stilt house ? C.When have you build this stilt house ? D.When will you build this stilt house ? Câu 32 : The car is more expensive than the bicycle => The bicycle_____ A. The bicycle is cheaper than the car B.The car is not inexpensive than the bicycle C. The car is not so cheap than the bicycle D. The bicycle isn't inexpensive than the car Giải nhanh giúp em ạ