Though he is busy, he is very _____ and makes a telephone call to his parents from time to time and tries his best to spare some time to visit them.

We regret to inform you that there are no tickets ______ for Friday’s performance.

It is very important for us parents to be ______ ___in educating children.

Over one thousand passengers remained_____ on trains for hours without air conditioning because of power failure on the railway,  

After a whole day’s heavy work ,the old worker returned home ,______________________.