11.
Up to now, the predicted Millennium computer bug . . . . . . . . very few problems, although many scientists last year . . . . . . . . a catastrophe.

13.
The simple future tense usually follows the construction:

20.
Fill in the blank with the correct form of the verb to complete the following sentence:

He ________ (begin)to collect small stones on his way back to the ashram from his regular daily walks.

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