Some people believe _______ has happened before or is happening now will repeat itself in the future.
A. whateverB. whenever.
C. whereever D. however
I found the lecture hard to follow because it _______ when I arrived.
A. startedB. was starting
C. would startD. had started
--- What time is it?
--- I have no idea. But just a minute, I ______ it for you.
A. checkB. checked
C. will checkD. would check
The best moment for the football star was _______ he scored the winning goal.
A. where B. when
C. how D. why
_______ the forest park is far away, a lot of tourists visit it every year.
A. AsB. When
C. Even thoughD. In case
There are still many problems ______ before we are ready for a long stay on the Moon.
A. solvingB. solved
C. being solvedD.to be solved
