One of the most important problems they had to consider was________of public health.
Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.
——Your book, Tommy? ——No, Mom, it’s my friend’s. ——Remember to return it to ____ name is on it.
I’d like to live somewhere ____ the sun shines all year long.
The days we have been looking forward to ____ soon.
——The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job? ——____ my students have a try?