I must be getting fat-I can _____ do my trousers up [ ]

He got well-prepared for the jobinterview, for he couldn’t risk _____ the goodopportunity.

Excuse me, could you tell me how I can learn German well—_____ having conversations with Germans.

He seemed absent-minded and _______ his careless playing, we lost the game[ ]

This special school accepts all disabled students, _____ educational level and background.[ ]