The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
I haven’t seen you for a couple of days. What have you been up _________?
–---What do you want to do next? We have half an hour until the basketball game. -----________. Whatever you want to do is fine with me.
I can understand _________ to live alone and be independent.
We wanted to get home before dark, but it didn’t quite _________ as planned.
Happy birthday, Alice! So you have _________ twenty-one already!