You'd better________ the instructions so that the children could understand them.
Persons under 16 ______ not be employed in our country.
Selecting a proper personal computer is no easy task because technology _____ so rapidly. A will change B will have changed C is changing D has changed
You’d better give the task to _____ can finish it ahead of time.
Is this the department______? A where he works in B in which he works C which he works D for which he works
Plastics and other similar rubbish that does not ______ may not be thrown into the sea anywhere.