Fill in each blank with an appropriate preposition :
1 . It's very difficult to find work _________ at the moment
2. This service is free _______ charge
3. In many ways you take ______ your mother .
4. This computer is still ________ guarantee
5. Money is not essential _______ happiness
1 . It's very difficult to find work on at the moment
2. This service is free of charge
3. In many ways you take after your mother .
4. This computer is still under guarantee
5. Money is not essential for happiness
câu 5 bạn làm sai rồi kìa :essential đi với to mà