1 . In the lab, keeping things clean and organized can help provide a safer ________.

A．system

B．method

C．investment

D．environment

2 . In the spring, a season ________ we are learning new rhythms of life，many of us find comfort in the natural world.

A．when

B．where

C．what

D．which

3 . It’s a good idea to choose a(n) ________ destination in case your first-choice tourist spot is not available.

A．annual

B．exact

C．alternative

D．pleasant

4 . I wanted to make dumplings but found I had ________ flour, so I went out to buy some.

A．made up for	B．run out of
C．kept away from	D．got down to

5 . —I was trying to place an order on your website, but I failed.
________ .I can take your order over the phone.

A．That’s fine

B．No way

C．My pleasure

D．Of course

6 . Ten days are devoted to this training program and ________ it be unsuccessful, it could be repeated later.

A．should

B．could

C．might

D．would

7 . We arrived at work in the morning and found that somebody ________ into the office during the night.

A．broke

B．had broken

C．has broken

D．was breaking

8 . I still have a few sweet memories of my childhood; ________, I remember times when I explored caves in the mountains with my friends.

A．in turn

B．by chance

C．in particular

D．by contrast