根据汉语意思翻译句子。我感到很惊讶，我和大卫都未受邀参加这个-优题课

To avoid the virus（病毒）, we should wash hands more carefully ________ we have meals.

A．

so

B．

before

C．

because

D．

although

If you want to go to university, you should take your schoolwork ________ .

A．

truly

B．

slowly

C．

seriously

D．

possibly

I have no money on me because I often pay ________ things through WeChat（微信）.

A．

to

B．

of

C．

by

D．

for

The ________ of oil goes higher and higher because of the war.

A．

price

B．

pride

C．

progress

D．

promise

Another three astronauts, Liu Yang, Chen Dong and Cai Xuzhe, have been sent into space. Let’s express（表达） our best wishes to ________ .

A．

they

B．

them

C．

their

D．

theirs