Помогите прошу !1. There __ a pair of shorts on the

Помогите прошу !
1. There __ a pair of shorts on the chair.
a) is b) are
2. My shoes __ nice.
a) is b) are
3. Your jeans __ in the wardrobe.
a) is b) are
4. His new clothes __ very expensive.
a) was b) were
5. How many children ___ there in the park yesterday?
a) was b) were