Our school has ______Art Festival every year.

Mike doesn’t think I can finish the task，so I’ll try harder to show he is wrong.

The manager and general engineer_____ very strict _____ his employees and ____ his work as well.

We had ________ really cold February thisyear.－Ican’t remember ________ spring when it snowed in Changzhou .

Some researchers believe that there is no doubt ____ a cure for AIDS will be found.