Question

英语语法填空

Answer 1

19. has been used
20. should be remembered
21. could not be taken
22. should be kept
23. could not be made
24. must be turned off
25. could be allowed to borrow
26. could not be lent
27. must be returned
28. would not be allowed

Answer 2

put into use should be remembered cannot be taken should be kept cannot be made be turned off can be borrowed cannot be lent must be returned are allowed