The scientists were waiting to see the problem _______.
Bicycling is good exercise; _______, it does not pollute the air.
Time,correctly, is money in the bank.
Don’t worry. The hard work that you do now ______later in life.
We’ve had a good start, but next, more work needs _____to achieve the final success.
Don't handle the vase as if it ______ made of steel.