Don’t believe in those ads that you can master a language in one month. Instead, it is a(n) _______process, which may last for years.
I can’t imagine _____that with such a famous author.
She pretended ________the letter I wrote the day before yesterday.
Our father often told us in the past that _____is believing.
Is______necessary to change trains at Beijing?
When and where to build the new power station ______ yet.