Could you please tell me something about thetwo _________________. They are exchange students of No. 1 Middle School.

On October 16, Lu Yitao was appointed director of 2016 Spring Festival Gala, which was not the first time he ________ in charge of the CCTV gala.

The Science Museum, ____________ we visited during a recent trip to Britain, is one of London’s tourist attractions.

下列各句，没有语病、句意明确的一项是 （ ）

Hurry up. There’s _____ time left.