He is only too ready to help others,seldom,________refusing them when they turn to him.
According to the rules, students must not _____ their books during examinations.
She may have missed the train, in _____ case she won't arrive for another hour.
He had a lot of friends, none of _____ could lend him any money.
He ran as fast as he could _____ to catch the bus.
I’d try even if I may fail ___ __ sit there worrying in time of trouble.