Johnny， it's noisy outside． Go and see what's going on．_____________．

I'm answering a call.（　　）

A．Just a minuteB．One more time

C．Let's goD．That's fine

Who is the space scientist from Beijing？

The man______ white over there． He's of medium height.（　　）

A．withB．inC．orD．for

It has been much easier for me to go to work________ shared bikes appeared．

But they also caused plenty of problems．(　　)

A．sinceB．beforeC．unlessD．though

Mum， I've signed for a big box by Future Express（快递）． What' s in it？

I'm not sure． It________ be a present from your brother． （　　）

A．mightB．mustC．shouldD．will

Were you told ________to arrive at the train station？

Yes． The group leader said we would meet there at half past ten． （　　）

A．howB．whyC．whenD．where