1. Visitors to the special exhibition are asked to leave their bags at the counter ---------to protect the displays as to ensure a pleasant experience for all.

a. as much as

b. as much

c. so long

d. only if

2. All members of the Baja basketball team are required to commit to a high-protein and carbohydrate diet ------- trianing for the national games.

a.when

b. that

c. by

d. at

3. Urban Textiles will not refund down payments to Ms, Smith ------she cancel her order after the products have been shipped.

a. should

b. otherwise

c. although

d. instead

4. Drivers waiting in the loading zone must switch off the engines of their delivery vans and avoid leaving them -----.

a. idle

b. valid

c. blank

d. empty

5. Charity foundations and educational institutions are -----from paying income tax to the government as they are considered nonprofit organizations.

a. contented

b, guaranteed

c. exempt

d. isolated