There is ______ what the weather will be like.

Those who said looking after children was an easy way to make money obviously ______ such a troublesome boy, she thought

---When will the expert come and give the lecture on economic development?---Not until our program_______.

The number of deaths from heart disease will be reduced greatly if people ____ to ear more fruit and vitamins. 

I called Mary many times yesterday evening, but I couldn’t get through. Her brother _________ on the phone all the time.