The girl was very disappointed when his boyfriend didn’t _______at the right time.

Nokia has    a family     of low-cost mobile phones based on Google's Android operating system.

Recently,  many parents choose to rent a house near schools and ______their children during their school years.

________ doing his experiment, he forgot to pick up his wife from the station. 

Rather than sticking to the principles stubbornly, China is now adopting a new concept in economic policies in a/an _______way that shows its own characteristics.