It is uncertain ______ the experiment is worth doing .
-----How do you find your visitor to the museum ?-----I thoroughly enjoyed it, it was ______ than I expected.
I hadn’t expected James to apologize but I had hoped _____ me.
Soon John came to a house _____ must be Kate’s .
--- Have you thought of the topic for the composition? ---Not yet, I _______ it very carefully, but I haven’t decided.
With the weather getting colder, visitors from Australia spent their _____ days in Beijing.