用所给单词的适当形式填空。. There ________(be) a teacher and thirteen students in the room. 2. His sister is very _________(help). She always helps others. 3. Her father cleans his car ________(two) a week. 4. Tom and Jack often practise ________(speak) Chinese. 5. Lily ________(not go) to school on Saturdays and Sundays.