Johnny studied in a university, and he a few dollars by doing odd jobs in his spare time.
The snow _____ to end at midnight and change to rain in the east as warm air is pushed in by dawn Monday.
Nowadays everything strange is ________ strange. That is to say, any unexpected thing is possible to happen.
These two areas are similar ________ they both have a high rainfall during this season.
When you go outing with your sisters, you must see to ________ that they are safe.
A model or an experiment in a science class can help students see things which would ______ remain hidden.