Cho tam giác ABC, M là trung điểm của cạnh BC, trên tia đối của tia MA lấy điểm E sao cho ME = MA.
a) Chứng minh: AC = BE
b) Gọi D là trung điểm của cạnh AB. Trên tia đối của tia DE lấy điểm F sao cho FD = DE. Chứng minh: AC = AF
Fill in the gaps with can, can’t, could, couldn’t, or was/ wasn’t able to.
0. I had my hands full, so I .......couldn’t/ wasn’t able to.............................. open the door.
1. When I was young, I .......................................................................... stand on my head.
2. Although he felt ill, he ........................................................................ finish all the paperwork.
3. Tony is clever. He ............................................................................... speak three languages.
4. I ............................................................................... afford that bag. It’s too expensive.
5. Although it was dark, he ...................................................................... find his way through the woods.
6. I heard his voice calling me, but I ...................................................... see him.
7. We’re busy tonight, so we ................................................................... come to the party.
8. When I entered the house, I ............................................................ smell fresh bread baking.
9. I ............................................................................... drive a car. I learnt when I was eighteen.