根据句意，用所给动词的适当形式填空。
⑴You should ________ (be) careful.
⑵They ________ (fly) to Shanghai yesterday.
⑶It’s time for us ________ (have) a rest.
⑷—________ paper________ (make) from wood?
—Yes.
⑸The girl ________ (ride) the bike is in Class One. We ________ (call) her Mary.