The computer system proved to be powerful some shortcomings

You don’t know me, do you— ________. Don’t you remember ________ the mountain with us last weekend

There aren’t many seats left for the concert; you had better make sure ________ two today.[ ]

The failure was a big _________ to him, but he didn’t _________ and soon got as enthusiastic as ever.

Mr. Black must be worried about something. You can ____ it from the look on his face.