Where is my English book?— I brought it to you _____you were in hospital yesterday afternoon

The well-known performer our Chinesefans often referred ______ at our school yesterday.

Please excuse my __ in without __.

The computer, _______ he paid ￥3,000, was once owned by his uncle.

What heavy rain it was!—Yes, but I love air after it rains. It smells so fresh. Fog and haze(雾霾)has become a big problem in China.