To improve your spoken English, you’d better listen to the tape ______. 

The task is too much for him, so he can’t continue ______any longer. He must get some help.

Recent studies have discovered that fathers uniquely contribute to the development of their children, _____in low income families.

His speech was extremely boring that it was ______interrupted by applause and cheers.

 Jogging is an effective way to keep fit. _____ , swimming is helpful for bodybuilding.