单选题 Many firms are （ ）on increasing their markets overseas.

单选题 Frankly speaking, he and I are not real friends, only nodding（ ）.

单选题 The two friends haven't（ ）with each other for years.

单选题 Her clinic has a （ ） stream of parents wanting help.

单选题 Can you（ ）to memory all the main points of the lecture?

单选题 Neighbors （ ） to the police about the noise from the building site.

单选题 It pays to（ ）as much as you can from reading and listening.

单选题 The naughty boy has no（ ）over himself.