—Why is the famous althlete absent from the game?—He has been________to take part in competitions for a year because of taking drags.

He ___ at the enemy, without saying a word.

If you meet difficulties when you are striving for your life goal, please ______ and you will succeed sooner or later.

--- Why was she unhappy yesterday ?--- A call from home ______ an attack of homesickness.

The student couldn’t ______ what the teacher was trying to explain.