—What have you learned from your experience in Thailand?—Well, meeting people from another culture ______ be very difficult．

It is usually warm here in March, but it _____ be rather cold sometimes.

Whale beachings（搁浅）_______ be caused by factors such as illness, or disorientation（迷失方向）caused by extra noise in the oceans, ______ shipping or oil and gas drilling.

—Can you tell me what to wear at the party?—If I            you, I            the blue jeans.

 —Must I wait for you here?—No, you ______.