I’m sorry I _______ your lecture yesterday, but I _____ busy recently. A missed, have been B miss, am C had missed, was D have missed, had been
I can't see any coffee in this cupboard. _______?
The doctor advised Joyce strongly that she should take a holiday, but _______ didn't help.
Aborigines' most common tool in Australia is ________ boomerang, which is used to kill ________ animals.
There is no doubt, in my opinion,_______ matters is not the speed, but the quality of the product.
_______,but it is also a great way to lower the number of greenhouse gases in the air.