根据句意,用所给动词的适当形式填空。 小题1: It’s getting dark. You’d better ____________ (not go) out now. 小题2:Sally took a photo of her friends while they ____________ (play) computer games. 小题3:Mary, ____________ (not reply) to your pen friend in the USA since you are too busy 小题4:Oil ____________ (catch) fire easily. You must be very careful. 小题5:At last, the two thieves ____________ (control) by the police.