Viết lại câu:
1. They keep the photos in that box
=> The photos...
2. The word is too difficult for us to spell
=> The word...
3. They made the film many years ago
=> The film ...
4. People say that he works very hard. 
=> He is...
5. Nobody can answer this question
=> This question...
6.My mother began to take yoga 2 months ago
=> My mother has...
7.They last met each other in June
=> They haven't...
8.Learning to swim is not easy
=> It is...
9. Although the weather is bad, we continue the trip
=> Despite...
10. He is a slow swimmer.
=> He swims ...
11. They have built a bridge across the river
=> A bridge...