He was known to have been hanging about and was not expected to pass the test. ______, his failure came as no wonder to his parents.

He seems to be doing nothing, but _____ he is just waiting for his chance.

Stress can be extremely damaging to your health. Exercise, __________, can reduce its effects.

When you drive home, you can’t be＿＿＿＿＿＿＿careful. 

My parents will go there by taxi because it is raining____________.