The old professor has such a bad memory that he looks for the watch while he is ___.
No one helped me. I did it all ________ myself.
—How often do you call your parents? —______, but usually once a week.
The young man thought carefully for several days and decided to ______ the job offer.
The traffic rule says young children under the age of four and ______ less than 40 pounds must be in a child safety seat.
After his operation, the old man was back ______ and he began to take exercise as usual.