How long did you spend going through the jungle during the exciting vacation—Going through the jungle______ us about three weeks.

Employees in a chemical factory should be given _____ training in safety.

You should _______ the doctor’s advice and _______ the medicine on time.

Measures _____to stop housing prices from rising too fast, but it remains to be seen whether they still work.

Daniel found ___ easy to finish writing the report on wildlife.