He has few friends and often feels lonely , _______he has much money.

Have you ever ridden a horse?— No, but I ________ a camel when I visited Egypt last year.[ ]

This large sum of donation money will begiven tolost their homes in theearthquake．

Pollution is damaging the environment, and the situation is particularly ________ in big cities.

I met a good friend of mine while Ionthe street.