3, Mr. Lam should wear gloves to protect his hand.
Mr. Lam had better ………………………………………………
4, He always washes his hands before meals. She always washes her hands before meals.
He always …………………………………………………. she.
5, I didn’t have a toothache. They didn’t have a toothache.
I didn’t ……………………………………………………they.
