下列各句中，没有语病的一句是（　　）

He_____ his right hand and then he was asked to______ from his chair .

My car _________. Could you please give me a ride tomorrow–I’m sorry I can’t. I’m _________ London tomorrow morning.

.We must take some photographs ______themicrocomputer.

Have you finished the maths problem?- Not yet, because I find it difficult ______.[ ]