Which is ________ to learn, singing or dancing, baby?

This math problem is ______ difficult ______ that one. [ ]

It was in the small house _______ was built with stone by his father _______ he spent his childhood.

Have you brought with you? We won’t have time to come back.—Don’t worry. All the things we need are here, in this big bag.

We’ll have a hiking trip, but when shall we meet? —Let’s make it ______ half past eight ______ the morning of June 21. [ ]