She tried her best to () the trouble. A: keep on B: keep back C: keep out of D: keep down

They walked so fast that I could not ________them. （ ） A: keep back B: keep away from C: keep out D: keep up with

3. The drug treatments ____________ passing the virus to her unborn child. A. keep the mother out B. keep the mother from C. keep the mother out of D. keep the mother back from

His occasional courtesies did not _______ his general rudeness. A: compensate for pay back keep up change into

To increase the distance to the vessel ahead by reducing one's own speed means ___ . A: fall back B: keep low speed C: unning afte D: drop back

What can you do about the back of the business card?You can either keep the back_____ or use it for _______.

The money will be used to keep a space vehicle on the moon busy ( ) back to the earth photographs and other information about the surface of the moon.

His occasional courtesies did not ( ) his general rudeness. A: keep up B: compensate for C: pay back D: change into

The boy resolved to keep back his tears before the strangers. However, they __________ (be) so kind and concerned that he broke down and cried.

She couldn't keep back her tears ______ she felt very sad. A: but B: so C: because D: or