About time:
Nearly time, high time. ex. "It's about time you bought a new car!" 

Against the clock:
To attempt to do something "against the clock" is to attempt to do something as fast as possible, usually in order to make a deadline. ex. "They were working against the clock to finish the project." 

(To) act one's age:

To behave in a more mature way. Frequently said to a child or teen. ex. "Bill, stop throwing rocks! Act your age!" 

https://www.youtube.com/watch?time_continue=1&v=pknMvlFTBHo&feature=emb_title

 

Correct the mistakes:

1. We are pleased to inform that we have started making business with a new client. Starting on February, we’ll be handling customer service calls for a cable company in United States. We’re very pleased that our company is continuing to grow up.

2. Do you think you would send me some information about shipping options? I’m wondering how can we insure the products arrive soon. We need these items until the end of the month at the latest.

3. Jerry, I’m forwarding you a question from one of our customer. Could you respond him as soon as possible?