—ou___________ stop me.
—Even if you __________it, I won't allow you to swim across the river.
| A．mustn't; dare not do | B．may ; dare not do |
| C．can; dare to do | D．needn't; dare do |
I have kept that portrait _____ I can see it every day, as it always reminds me of my university days in London.
| A．which | B．where | C．whether | D．when |
The ability to store knowledge makes computers different from every other machine _____ invented.
| A．ever | B．thus | C．yet | D．as |
_____ quite recently, most mothers in Britain did not take paid work outside the home.
| A．Before | B．Until | C．From | D．Since |
I’ve already told you that I’m going to but it, _____.
| A．however much it costs | B．how much does it cost |
| C．however does it cost much | D．no matter how it cost |
You will want two trees about ten feet apart, from ______ to suspend your tent.
| A．there | B．them | C．which | D．where |