34. The space is left to let the rail expand when it gets hot, ______?
| A．isn’t it | B．is it | C．doesn’t it | D．does it |
John talked with me for about an hour yesterday. Never _______ him talk so much.
| A．had I heard | B．did I hear | C．I had heard | D．I heard |
Mother told Jim to ______ the milk until it boiled and then turn off the gas.
| A．observe | B．watch | C．notice | D．glance at |
Some friends tried to settle the quarrel between Mr. and Mrs. Smith without hurting the feeling of _____, but failed.
| A．none | B．either | C．all | D．neither |
in the regulations that you should not tell other people the password of your e-mail account.
| A．It requires | B．It is required | C．What requires | D．What is required |
Always read the on the bottle carefully and take the right amount of medicine.
| A．instructions | B．explanation | C．description | D．introductions |