John does important research _______ the best ways to help the old.

Many a student _____ playing games on theplayground and only one girl or two _____ reading in the classroom.

Just like a voyage at sea,our life journey, _______ days are limited,is full of difficulties.

下列各句中，没有语病的一句是(　　)

I’m planning to two hundred books to the students in poor areas .