下列各句中，没有语病的一句是（ ）

Infrastructure Investment Bank , its headquarter______ in Beijing, is an inter-governmental agency which is intended for multi-development of Infrastructure in Asia.

it is hopedthat college students should be equipped with the ability to take a good set ofnotes, this is not always the case

Look at the ______ girl! How ______ she is singing.

Let’s back up Where was I—You ___________________about the trip to SouthAfrica