Isn’t it hard to drive downtown to work—Yes，that’s why I________to work by train

What have you done these days?— I’ve read all the books _____ you gave me because they are the best ones _____ are on the subject.

To make our city more beautiful, rubbish _________ into the river.

Taiwan is ________ the south-east of China and Japan is ________ the east of China.

How many days are there in March —There are _______.