1 . — Was it under the tree ________ you were away talking to him?
— Yes, but when I got back there, my bike was gone.

A．that

B．where

C．which

D．while

2 . Tired __________ he was, he still went on with his work.

A．although

B．if

C．as

D．while

3 . Dad has changed a lot over twenty years. Mum, ______, looks almost the same.

A．despite

B．though

C．although

D．while

4 . He can’t attend the party __________ he is up to his academic paper.

A．while

B．when

C．because

D．unless

5 . She was thinking of her friend ________ Tom called her.

A．as

B．when

C．until

D．while

6 . We were playing in the park happily ________ it suddenly started to rain.

A．while

B．since

C．after

D．when

7 . Last night, I was packing my bag and texting a message to my boss ________ I heard a cry for help from outside the office.

A．when

B．as

C．before

D．while

8 . The doctor will see you again next week. 　　　　, you must rest as much as possible.

A．Meanwhile	B．Whenever
C．When	D．While

9 . Multitasking reduces the quality of our work ______ it makes it hard for us to organize thoughts and remove irrelevant information.

A．though

B．as

C．while

D．if

10 . ________ you are middle school students, you should learn how to look after yourselves.

A．Though

B．While

C．Since

D．Unless