President Xi Jinping paid______important visit to the US in 2017．

And he was warmly welcomed by Donald Trump，_____45th American president．（　　）

A．a； theB．an； theC．the； aD．an； a

Nowadays China has about 25，000 kilometers of high﹣speed railways．

That's ______of the world's total．（　　）

A．two thirdB．two﹣thirdC．two thirdsD．two three

Could you give me a few ______ on how to spend the coming summer holiday？

OK．Let me see．（　　）

A．hobbiesB．knowledge

C．suggestionsD．information

Mom，_____I play computer games this evening？

Sure， but you_____finish your homework first．（　　）

A．can； mustB．can； mustn't

C．may； couldD．may； can't

Mary， how can I get to Xianning from Wuhan next week？

You'd better take a train．_____the suitable trains in the timetable．（　　）

A．Set upB．Look upC．Take upD．Put up