He is the first person you can think of to rely on, for he is always willing to ________ whoever is in trouble.
You'd better stay at school now. Look! The sky is overcast with dark clouds. I'm afraid _____ rain is going to fall.
Let's hurry to _____ that bus or we'll be late for school.
Though Queen Elizabeth is in her late seventies, she is still _____ in thinking.
It will do you good to _____ a holiday.
If you can speak very ______ English, you will have more chances to find a job than others.