Don’t leave the water ______ while you brush your teeth.
I _______ use a clock to wake me up because at six o’clock every morning the train comes by my house.
A number of tests have been conducted to _______ that these drugs have no side effects.
Every year, typhoons and losses ______ lead to are frightening though measures have been taken.
The managers discussed the plan that they would like to see __________ the next year.
I can’t thank him too much, ____________ I couldn’t have finished the project in time.