---Where has Mary been? I haven't seen her all day?---Oh,in order not to be disturbed, she spent the whole day __in the study, ___ her report.

The handbag___ several days ago was found ____ under the seat inside the railway station. 

_____ to sunlight for three days during sports meeting, everybody got a little sunburnt.

“CCTV will provide us with a better platform, ______ at helping our brands to make a bigger sale next year,” the group leader said.

The explorer traveled to several remote villages, _____a lot of unusual information.