.Robert made a call to his parents yesterday afternoon. To his disappointment, _________of them answered it.
How can you expect me to make friends ____ you if you always play jokes ____ me?
―____ go out for a picnic with us this afternoon?―I’d like to, but I’ll be busy preparing for the test.
Have you ever _____ playing in front of thousands of people at a concert?
It’s really dangerous. One more step, ______ the baby will fall into the pool.
Can you believe that in ______ a rich country there should be _______many people.