Help the exhausted explorer finish his dramatic diary entry by choosing the correct verb phrase for each gap.

Looking back at the expedition, little did we know that our guide's map was completely upside down. We were explicitly warned that under no circumstances must we approach the sleeping hippos. It was a true nightmare; scarcely had we pitched our tents when the monsoon rains began to pour.

Looking back at the expedition, little did we know that our guide's map was completely upside down.

Placing the restrictive adverb little at the start of the clause requires subject-auxiliary inversion. We add the auxiliary did for the past tense, followed by the subject and the base verb (know). "Had we knew" is grammatically incorrect because had requires a past participle (known).

We were explicitly warned that under no circumstances must we approach the sleeping hippos.

The negative phrase under no circumstances triggers inversion. The modal verb must swaps places with the subject we.

It was a true nightmare; scarcely had we pitched our tents when the monsoon rains began to pour.

Scarcely is a restrictive adverb often used with the past perfect to show that one event happened immediately after another. We invert the auxiliary had and the subject we. "Did we pitched" is incorrect because did requires the base verb (pitch).